Kristiansen, Bjarne, Gunner Barfod, Jesper Bredesen, Jes Erin-madsen, Bjarne Grum, Mogen W. Horsnaes, and Jens Ranch Aalberg. 1987. “Epidemiology of Proximal Humeral Fractures”. Acta Orthopaedica 58 (1):75-77. https://doi.org/10.3109/17453678709146347.