Lübbeke, A., J. L. Rees, C. Barea, C. Combescure, A. J. Carr, and A. J. Silman. “International Variation in Shoulder Arthroplasty”. Acta Orthopaedica, vol. 88, no. 6, Nov. 2017, pp. 592-9, doi:10.1080/17453674.2017.1368884.