The Elbow Self-Assessment Score (ESAS): development and validation of a new patient-reported outcome measurement tool for elbow disorders. - Beirer, Marc; Friese, Henrik; Lenich, Andreas; Crönlein, Moritz; Sandmann, Gunther; Biberthaler, Peter; Kirchhoff, Chlodwig; Siebenlist, Sebastian; Sandmann, Gunther H (Knee Surgery, Sports Traumatology, Arthroscopy, 2017)