title: Letter to the editor regarding: "Causal assessment of occupational lifting and low back pain: results of a systematic review" by Wai et al.
authors.forename: Stuart M
authors.initials: SM
authors.lastname: McGill
mesh_terms: D006801:Humans; D017770:Lifting / Q000009:adverse effects*; D017116:Low Back Pain / Q000209:etiology*; D009784:Occupational Diseases / Q000209:etiology*; D012196:Review Literature as Topic