The Natural History of Full-Thickness Rotator Cuff Tears in Randomized Controlled Trials: A Systematic Review and Meta-analysis. - Khatri, Chetan; Ahmed, Imran; Parsons, Helen; Smith, Nicholas A.; Lawrence, Thomas M.; Modi, Chetan S.; Drew, Stephen J.; Bhabra, Gev; Parsons, Nicholas R.; Underwood, Martin; Metcalfe, Andrew J. (American Journal of Sports Medicine, 2019)