Comparison of the Neer classification to the 2018 update of the Orthopedic Trauma Association/AO fracture classification for classifying proximal humerus fractures oleh Meir T. Marmor, MD, Julie Agel, MA, ATC, Jarrod Dumpe, MD, James F. Kellam, MD, Geoffrey S. Marecek, MD, Eric Meinberg, MD, Mai P. Nguyen, MD, Stephen Sims, MD, Gillian L. Soles, MD, Matthew D. Karam, MD