Helle Collatz Christensen

Search results

• 2025

  An assessment of long-term complications following prehospital intraosseous access: A nationwide study

  Petersen, L. B., Bogh, S. B., Hansen, P. M., Milling, L., Knudsen, J. S., Pedersen, H., Christensen, E. F., Væggemose, U., Folke, F., Wolthers, S. A., Christensen, H. C., Brøchner, A. C. & Mikkelsen, S., 2025, In: Resuscitation. 206, 7 p., 110454.

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• Geographical location of ischemic stroke patients affects thrombolysis availability in Denmark

  Mortensen, E. H., Wenstrup, J., Blomberg, S. N. F., Kruuse, C. & Christensen, H. C., 2025, In: Journal of the Neurological Sciences. 469, 7 p., 123382.

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• 2024

  Ambulance response times and 30-day mortality: a Copenhagen (Denmark) registry study

  Mills, A. A. M., Mills, E. H. A., Blomberg, S. N. F., Christensen, H. C., Møller, A. L., Gislason, G., Køber, L., Kragholm, K. H., Lippert, F., Folke, F., Andersen, M. P. & Torp-Pedersen, C., 2024, In: European Journal of Emergency Medicine. 31, 1, p. 59-67 9 p.

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• Association Between Defibrillation Using LIFEPAK 15 or ZOLL X Series and Survival Outcomes in Out-of-Hospital Cardiac Arrest: A Nationwide Cohort Study

  Meilandt, C., Qvortrup, M., Bøtker, M. T., Folke, F., Borup, L., Christensen, H. C., Milling, L., Lauridsen, K. G. & Løfgren, B., 2024, In: Journal of the American Heart Association. 13, 7, 9 p., e033913.

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• Association between mortality and phone-line waiting time for non-urgent medical care: A Danish registry-based cohort study

  Mills, E. H. A., Møller, A. L., Gnesin, F., Zylyftari, N., Jensen, B., Christensen, H. C., Blomberg, S. N., Kragholm, K. H., Gislason, G., Køber, L., Gerds, T., Folke, F., Lippert, F., Torp-Pedersen, C. & Andersen, M. P., 2024, In: European Journal of Emergency Medicine. 31, 2, p. 127-135 9 p.

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• Characteristics and critical care interventions in drowning patients treated by the Danish Air Ambulance from 2016 to 2021: a nationwide registry-based study with 30-day follow-up

  Breindahl, N., Wolthers, S. A., Møller, T. P., Blomberg, S. N. F., Steinmetz, J. & Christensen, H. C., 2024, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 32, 11 p., 17.

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• Emergency call utilization over a 10-years period: an observational study in Region Zealand, Denmark, 2013–2022

  Møller, T. P., Jensen, J. T., Ersbøll, A. K., Blomberg, S. N. F. & Christensen, H. C., 2024, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 32, 1, 11 p., 129.

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• Foreign body airway obstruction resulting in out-of-hospital cardiac arrest in Denmark – Incidence, survival and interventions

  Wolthers, S. A., Holgersen, M. G., Jensen, J. T., Andersen, M. P., Blomberg, S. N. F., Mikkelsen, S., Christensen, H. C. & Jensen, T. W., 2024, In: Resuscitation. 198, 8 p., 110171.

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• Head injuries related to bicycle collisions and helmet use – an observational study

  Beck, E. M., Wolthers, S. A., Blomberg, S. N., Breindahl, N., Eskesen, V., Lippert, F. & Christensen, H. C., 2024, In: Traffic Injury Prevention. 25, 8, p. 1081-1088 8 p.

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• Medical dispatchers’ experience with live video during emergency calls: a national questionnaire study

  Bohnstedt-Pedersen, N. H., Linderoth, G., Helios, B., Christensen, H. C., Thomsen, B. K., Bekker, L., Gram, J. K. B., Vaeggemose, U. & Gehrt, T. B., 2024, In: BMC Health Services Research. 24, 1, 12 p., 1442.

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• Patient flow analysis with fast-track MRI for suspected stroke in the emergency department and associated non-comprehensive stroke center

  Sagar, M. V., Gandrup, K. L., Jensen, D., Krag, C. H., Boesen, M. P., Raaschou, H., Christensen, H. C. & Kruuse, C., 2024, In: Therapeutic Advances in Neurological Disorders. 17, 15 p.

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• Patients' use of Danish emergency medical services before and during the COVID-19 pandemic: a register-based study

  Lindskou, T. A., Bogh, S. B., Kløjgaard, T. A., Fløjstrup, M., Folke, F., Væggemose, U., Christensen, H. C., Christensen, E. F., Brabrand, M. & Mikkelsen, S., 2024, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 32, 1, 10 p., 92.

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• Prediction model for future OHCAs based on geospatial and demographic data: An observational study

  Bundgaard Ringgren, K., Ung, V., Gerds, T. A., Kragholm, K. H., Ascanius Jacobsen, P., Lyng Lindgren, F., Grabmayr, A. J., Christensen, H. C., Mills, E. H. A., Kollander Jakobsen, L., Yonis, H., Hansen, C. M., Folke, F., Lippert, F. & Torp-Pedersen, C., 2024, In: Medicine (United States). 103, 19, 6 p., E38070.

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• Prehospital interventions and outcomes in traumatic cardiac arrest: a population-based cohort study using the Danish Helicopter Emergency Medical Services data

  Wolthers, S. A., Breindahl, N., Jensen, T. W., Holgersen, M. G., Møller, T. P., Blomberg, S. N. F., Andersen, L. B., Mikkelsen, S., Steinmetz, J. & Christensen, H. C., 2024, In: European Journal of Emergency Medicine. 31, 5, p. 324-331 8 p.

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• Prehospital management and outcomes of patients calling with chest pain as the main complaint

  Ahmed, S., Gnesin, F., Christensen, H. C., Blomberg, S. N., Folke, F., Kragholm, K., Bøggild, H., Lippert, F., Torp-Pedersen, C. & Møller, A. L., 2024, In: International Journal of Emergency Medicine. 17, 1, 10 p., 158.

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• Prehospital Pulse-Dose Glucocorticoid in ST-Segment Elevation Myocardial Infarction: The PULSE-MI Randomized Clinical Trial

  Madsen, J. M., Engstrøm, T., Obling, L. E. R., Zhou, Y., Nepper-Christensen, L., Beske, R. P., Vejlstrup, N. G., Bang, L. E., Hassager, C., Folke, F., Kyhl, K., Andersen, L. B., Christensen, H. C., Rytoft, L., Arslani, K., Holmvang, L., Pedersen, F., Ahlehoff, O., Jabbari, R., Barfod, C. & 5 others, Hougaard, M., Minkkinen, M., Tilsted, H-H., Sørensen, R. & Lønborg, J. T., 2024, In: JAMA Cardiology. 9, 10, p. 882-891 10 p.

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• Prevalence and prognostic relevance of electrocardiographic abnormalities among patients with ANCA-associated vasculitis

  Nygaard, L., Liboriussen, C. H., Carlson, N., Nelveg-Kristensen, K. E., Kristensen, S., Andersen, M. P., Christensen, H. C., Kragholm, K., Graff, C., Torp-Pedersen, C., Ivarsen, P., Svensson, M., Gregersen, J. W., Polcwiartek, C. & DANVAS investigators, 2024, (E-pub ahead of print) In: Rheumatology (Oxford, England).

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• Prodromal complaints and 30-day survival after emergency medical services-witnessed out-of-hospital cardiac arrest

  Larsen, M. B., Blom-Hanssen, E., Gnesin, F., Kragholm, K. H., Lass Klitgaard, T., Christensen, H. C., Lippert, F., Folke, F., Torp-Pedersen, C. & Ringgren, K. B., 2024, In: Resuscitation. 197, 7 p., 110155.

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• Racing against time: Emergency ambulance dispatches and response times, a register-based study in Region Zealand, Denmark, 2013–2022

  Jensen, J. T., Møller, T. P., Blomberg, S. N. F., Ersbøll, A. K. & Christensen, H. C., 2024, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 32, 1, 12 p., 108.

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• Survival of the fastest? A descriptive analysis of severely injured trauma patients primarily admitted or secondarily transferred to major trauma centers in a Danish inclusive trauma system

  Møller, T. P., Jensen, J. T., Medici, R. B., Rudolph, S. S., Andersen, L. B., Roed, J., Blomberg, S. N. F., Christensen, H. C. & Edwards, M., 2024, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 32, 10 p., 87.

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• The Danish Nationwide Electrocardiogram (ECG) Cohort

  Polcwiartek, C., Andersen, M. P., Christensen, H. C., Torp-Pedersen, C., Sørensen, K. K., Kragholm, K. & Graff, C., 2024, In: European Journal of Epidemiology. 39, p. 325–333 9 p.

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• Time From Distress Call to Percutaneous Coronary Intervention and Outcomes in Myocardial Infarction

  Mills, E. H. A., Møller, A. L., Engstrøm, T., Folke, F., Pedersen, F., Køber, L., Gnesin, F., Zylyftari, N., Blomberg, S. N. F., Kragholm, K., Gislason, G., Jensen, B., Lippert, F., Kragelund, C., Christensen, H. C., Andersen, M. P. & Torp-Pedersen, C., 2024, In: JACC: Advances. 3, 7, 11 p., 101005.

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• Treat and release: an observational study of non-conveyed high-acuity dispatches in a Danish emergency medical system

  Wolthers, S. A., Mikaelsson, T. J., Holgersen, M. G., Blomberg, S. N. F., Andersen, L. B., Mikkelsen, S. & Christensen, H. C., 2024, (E-pub ahead of print) In: Internal and Emergency Medicine.

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• “I think we should wait and see”: A qualitative study of call-takers’ decision-making in consultations with patients suffering unrecognized myocardial infarction

  Jensen, B., Vardinghus – Nielsen, H., Mills, E. H. A., Møller, A. L., Gnesin, F., Zylyftari, N., Kragholm, K., Folke, F., Christensen, H. C., Blomberg, S. N., Torp-Pedersen, C. & Bøggild, H., 2024, In: Patient Education and Counseling. 128, 12 p., 108376.

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• 2023

  AED applied, not recommending defibrillation – A validation study of the new variable AED in the Danish Cardiac Arrest Registry

  Casarini, E., Wolthers, S. A., Ringgren, K. B., Blomberg, S. N. F. & Christensen, H. C., 2023, In: Resuscitation. 186, 109725.

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• All-cause mortality among Danish nursing home residents before and during the COVID-19 pandemic: a nationwide cohort study

  Andersen, M. P., Mills, E. H. A., Meddis, A., Sørensen, K. K., Butt, J. H., Køber, L., Poulsen, H. E., Phelps, M., Gislason, G., Christensen, H. C., Schou, M., Fosbøl, E. L., Gerds, T. A., Kragholm, K. & Torp-Pedersen, C., 2023, In: European Journal of Epidemiology. 38, p. 523–531 9 p.

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• A retrospective study on machine learning-assisted stroke recognition for medical helpline calls

  Wenstrup, J., Havtorn, J. D., Borgholt, L., Blomberg, S. N., Maaloe, L., Sayre, M. R., Christensen, H., Kruuse, C. & Christensen, H. C., 2023, In: npj Digital Medicine. 6, 1, 8 p., 235.

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• Association between using a prehospital assessment unit and hospital admission and mortality: a matched cohort study

  Wolthers, S. A., Blomberg, S. N. F., Breindahl, N., Anjum, S., Hägi-Pedersen, D., Ersbøll, A., Andersen, L. B. & Christensen, H. C., 2023, In: BMJ Open. 13, 9, 9 p., e075592.

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• Association of intraosseous and intravenous access with patient outcome in out-of-hospital cardiac arrest

  Nilsson, F. N., Bie-Bogh, S., Milling, L., Hansen, P. M., Pedersen, H., Christensen, E. F., Knudsen, J. S., Christensen, H. C., Folke, F., Høen-Beck, D., Væggemose, U., Brøchner, A. C. & Mikkelsen, S., 2023, In: Scientific Reports. 13, 1, 7 p., 20796.

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• Associations between emergency call stroke triage and pre-hospital delay, primary hospital admission, and acute reperfusion treatment among early comers with acute ischemic stroke

  Gude, M. F., Valentin, J. B., Christensen, H. C., Mikkelsen, S., Søvsø, M. B., Andersen, G., Kirkegaard, H. & Johnsen, S. P., 2023, In: Internal and Emergency Medicine. 18, p. 2355–2365 11 p.

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• Danish Drowning Formula for identification of out-of-hospital cardiac arrest from drowning

  Breindahl, N., Wolthers, S. A., Jensen, T. W., Holgersen, M. G., Blomberg, S. N. F., Steinmetz, J., Christensen, H. C. & the Danish Cardiac Arrest Group, 2023, In: American Journal of Emergency Medicine. 73, p. 55-62 8 p.

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• Dispatcher Stroke/TIA Recognition in Emergency Medical Call Center and Out-of-Hours Service Calls in Copenhagen, Denmark

  Wenstrup, J., Blomberg, S. N., Christensen, H., Folke, F., Christensen, H. C. & Kruuse, C., 2023, In: Neurology: Clinical Practice. 13, 6, 10 p., e200197.

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• Ethical considerations in the prehospital treatment of out-of-hospital cardiac arrest: A multi-centre, qualitative study

  Milling, L., Nielsen, D. S., Kjær, J., Binderup, L. G., de Muckadell, C. S., Christensen, H. C., Christensen, E. F., Lassen, A. T. & Mikkelsen, S., 2023, In: PLoS ONE. 18, 7, 19 p., e0284826.

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• Evaluation of a critical incident management system on mental health in lifeguard organisations: A retrospective study

  Breindahl, N., Strange, K. F., Østergaard, D. & Collatz Christensen, H., 2023, In: BMJ Open Sport and Exercise Medicine. 9, 1, e001499.

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• Geographical Association Between Basic Life Support Courses and Bystander Cardiopulmonary Resuscitation and Survival from OHCA in Denmark

  Jensen, T. W., Ersbøll, A. K., Folke, F., Andersen, M. P., Blomberg, S. N., Holgersen, M. G., Andersen, L. B., Lippert, F., Torp-Pedersen, C. & Christensen, H. C., 2023, In: Open Access Emergency Medicine. 15, p. 241-252 12 p.

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• "I just haven't experienced anything like this before": A qualitative exploration of callers' interpretation of experienced conditions in telephone consultations preceding a myocardial infarction

  Jensen, B., Vardinghus-Nielsen, H., Mills, E. H. A., Møller, A. L., Gnesin, F., Zylyftari, N., Kragholm, K., Folke, F., Christensen, H. C., Blomberg, S. N., Torp-Pedersen, C. & Bøggild, H., 2023, In: Patient Education and Counseling. 109, 1 p., 107643.

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• Long-Term Quality of Life After Out-of-Hospital Cardiac Arrest

  Yonis, H., Sørensen, K. K., Bøggild, H., Ringgren, K. B., Malta Hansen, C., Granger, C. B., Folke, F., Christensen, H. C., Jensen, B., Andersen, M. P., Joshi, V. L., Zwisler, A-D., Torp-Pedersen, C. & Kragholm, K., 2023, In: JAMA Cardiology. 8, 11, 9 p.

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• Pre-hospital symptoms associated with acute bacterial meningitis differs between children and adults

  Hovmand, N., Christensen, H. C., Lundbo, L. F., Kronborg, G., Darsø, P., Blomberg, S. N. F. & Benfield, T., 2023, In: Scientific Reports. 13, 1, 9 p., 21479.

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• Recognition of visual symptoms in stroke: a challenge to patients, bystanders, and Emergency Medical Services

  Berg, K. P., Sørensen, V. F. I., Blomberg, S. N. F., Christensen, H. C. & Kruuse, C., 2023, In: BMC Emergency Medicine. 23, 1, 17 p., 96.

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• Registered prodromal symptoms of out-of-hospital cardiac arrest among patients calling the medical helpline services

  Zylyftari, N., Lee, C. J. Y., Gnesin, F., Møller, A. L., Mills, E. H. A., Møller, S. G., Jensen, B., Ringgren, K. B., Kragholm, K., Christensen, H. C., Blomberg, S. N. F., Tan, H. L., Folke, F., Køber, L., Gislason, G. & Torp-Pedersen, C., 2023, In: International Journal of Cardiology. 374, p. 42-50 9 p.

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• The Danish National Child Health Register

  Andersen, M. P., Wiingreen, R., Eroglu, T. E., Christensen, H. C., Polcwiartek, L. B., Blomberg, S. N. F., Kragholm, K., Torp-Pedersen, C. & Sørensen, K. K., 2023, In: Clinical Epidemiology. 15, p. 1087-1094 8 p.

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• Training in Basic Life Support and Bystander-Performed Cardiopulmonary Resuscitation and Survival in Out-of-Hospital Cardiac Arrests in Denmark, 2005 to 2019

  Jensen, T. W., Ersbøll, A. K., Folke, F., Wolthers, S. A., Andersen, M. P., Blomberg, S. N., Andersen, L. B., Lippert, F., Torp-Pedersen, C. & Christensen, H. C., 2023, In: JAMA network open. 6, 3, p. E233338 12 p.

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• Traumatic cardiac arrest - a nationwide Danish study

  Wolthers, S. A., Jensen, T. W., Breindahl, N., Milling, L., Blomberg, S. N., Andersen, L. B., Mikkelsen, S., Torp-Pedersen, C. & Christensen, H. C., 2023, In: BMC Emergency Medicine. 23, 1, 11 p., 69.

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• When the machine is wrong. Characteristics of true and false predictions of Out-of-Hospital Cardiac arrests in emergency calls using a machine-learning model

  Nikolaj Blomberg, S., Jensen, T. W., Porsborg Andersen, M., Folke, F., Kjær Ersbøll, A., Torp-Petersen, C., Lippert, F. & Collatz Christensen, H., 2023, In: Resuscitation. 183, 7 p., 109689.

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• 2022

  Activation of Citizen Responders to Out-of-Hospital Cardiac Arrest During the COVID-19 Outbreak in Denmark 2020

  Gregers, M. C. T., Andelius, L., Hansen, C. M., Kragh, A. R., Torp-Pedersen, C., Christensen, H. C., Kjoelbye, J. S., Vaeggemose, U., Christensen, E. F. & Folke, F., 2022, In: Journal of the American Heart Association. 11, 6, 14 p., 024140.

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• Artificial intelligence in Emergency Medical Services dispatching: assessing the potential impact of an automatic speech recognition software on stroke detection taking the Capital Region of Denmark as case in point

  Scholz, M. L., Collatz-Christensen, H., Blomberg, S. N. F., Boebel, S., Verhoeven, J. & Krafft, T., 2022, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 30, 36.

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• Behavioral factors associated with SARS-CoV-2 infection

  Cajar, M. D., Tan, F. C. C., Boisen, M. K., Krog, S. M., Nolsoee, R., Christensen, H. C., Andersen, M. P., Moeller, A. L., Gerds, T. A., Pedersen-Bjergaard, U., Lindegaard, B., Kristensen, P. L., Christensen, T. B., Torp-Pedersen, C. & Lendorf, M. E., 2022, In: BMJ Open. 12, 6

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• Characteristics of low acuity prehospital emergency patients with 48-h mortality, an observational cohort study

  Petersen, J. A. D., Blomberg, S. N., Lippert, F. & Christensen, H. C., 2022, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 30, 64.

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• cSocioeconomic Disparities in Prehospital Emergency Care in a Danish Tax-Financed Healthcare System: Nationwide Cohort Study

  Frydenlund, J., Mackenhauer, J., Christensen, E. F., Christensen, H. C., Væggemose, U., Steinmetz, J. & Johnsen, S. P., 2022, In: Clinical Epidemiology. 14, p. 555-565 11 p.

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• Endoskopisk transduodenal fjernelse af galdeblæresten hos patient med nekrotiserende pankreatitis

  Translated title of the contribution: Endoscopic transduodenal removal of gallbladder stones in a patient with necrotizing pancreatitisChristensen, H., Novovic, S., Karstensen, J. G., Lauritsen, M. L. & Schmidt, P. N., 2022, In: Ugeskrift for Laeger. 184, 40, 3 p., V04220266.

  Research output: Contribution to journal › Journal article › Research › peer-review

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