title: Comment on: Appropriateness of study design.
authors.forename: Dan
authors.initials: D
authors.lastname: Perry
mesh_terms: D016022:Case-Control Studies; D005938:Glucocorticoids / Q000009:adverse effects; D006801:Humans; D007270:Injections, Intra-Articular; D012107:Research Design; D000070636:Rotator Cuff Injuries; D009626:Terminology as Topic
chemical_list: D005938:Glucocorticoids