title: Letters.
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Maher
mesh_terms: D005081:Exercise Therapy / Q000009:adverse effects; D005355:Fibrosis / Q000209:etiology; D006801:Humans; D008161:Lumbosacral Region; D018579:Patient Selection; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D013123:Spinal Fusion / Q000009:adverse effects / Q000706:statistics & numerical data; D013131:Spine / Q000601:surgery*