Let’s Agree to Disagree on Operative versus Nonoperative (LADON) treatment for proximal humerus fractures: Study protocol for an international multicenter prospective cohort study

• Ruben J. Hoepelman ,

  Roles Investigation, Methodology, Visualization, Writing – original draft, Writing – review & editing

  * E-mail: rjhoepelman@gmail.com

  Affiliations Department of Trauma Surgery, UMC Utrecht, Utrecht, The Netherlands, Department of Trauma Surgery, Diakonessenhuis Utrecht, Utrecht, The Netherlands

  https://orcid.org/0000-0003-2298-244X

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• Yassine Ochen,

  Roles Conceptualization, Methodology, Writing – original draft, Writing – review & editing

  Affiliations Department of Trauma Surgery, UMC Utrecht, Utrecht, The Netherlands, Department of Trauma Surgery St. Antonius Hospital Nieuwegein, Nieuwegein, The Netherlands

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• Frank J. P. Beeres,

  Roles Conceptualization, Methodology, Writing – review & editing

  Affiliation Department of Trauma Surgery, Cantonal Hospital of Lucerne, Luzerne, Switzerland

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• Herman Frima,

  Roles Writing – review & editing

  Affiliation Department of Trauma Surgery, Noordwest Ziekenhuisgroep Alkmaar, Alkmaar, The Netherlands

  https://orcid.org/0000-0002-5913-5685

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• Christoph Sommer,

  Roles Writing – review & editing

  Affiliation Department of Trauma Surgery, Kantonsspital Graubünden, Chur, Switzerland

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• Christian Michelitsch,

  Roles Writing – review & editing

  Affiliation Department of Trauma Surgery, Kantonsspital Graubünden, Chur, Switzerland

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• Reto Babst,

  Roles Writing – review & editing

  Affiliations Department of Trauma Surgery, Cantonal Hospital of Lucerne, Luzerne, Switzerland, Department of Health Science and Medicine, University of Lucerne, Lucerne, Switzerland

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• Isabelle R. Buenter,

  Roles Writing – review & editing

  Affiliation Department of Trauma Surgery, Cantonal Hospital of Lucerne, Luzerne, Switzerland

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• Detlef van der Velde,

  Roles Writing – review & editing

  Affiliation Department of Trauma Surgery St. Antonius Hospital Nieuwegein, Nieuwegein, The Netherlands

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• Egerbert-Jan M. M. Verleisdonk,

  Roles Writing – review & editing

  Affiliation Department of Trauma Surgery, Diakonessenhuis Utrecht, Utrecht, The Netherlands

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• Rolf H. H. Groenwold,

  Roles Conceptualization, Methodology, Writing – original draft, Writing – review & editing

  Affiliations Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands, Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands

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• Roderick M. Houwert,

  Roles Conceptualization, Writing – original draft, Writing – review & editing

  Affiliation Department of Trauma Surgery, UMC Utrecht, Utrecht, The Netherlands

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• Mark van Heijl

  Roles Conceptualization, Methodology, Writing – original draft, Writing – review & editing

  Affiliations Department of Trauma Surgery, UMC Utrecht, Utrecht, The Netherlands, Department of Trauma Surgery, Diakonessenhuis Utrecht, Utrecht, The Netherlands

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