Supplemental material, DS_10.1177_0363546520908849 for Augmentation of Tendon Graft–Bone Tunnel Interface Healing by Use of Bioactive Platelet-Rich Fibrin Scaffolds by Chin-Chean Wong, Yi-Yen Yeh, Tsung-Lin Yang, Yang-Hwei Tsuang and Chih-Hwa Chen in The American Journal of Sports Medicine