Platelet Concentration Does Not Influence Clinical Efficacy and Retear Rates of Rotator Cuff Repair With Platelet-Rich Plasma: A Systematic Review and Meta-analysis With Meta-Regression. - Lim, Joseph J.; Stepaniuk, Emilea A.; Belk, John W.; Keeter, Carson; Oeding, Jacob F.; Dragoo, Jason L.; McCarty, Eric C.; Frank, Rachel M. (American Journal of Sports Medicine, 2026)