title: Commentary: we still need observational studies of drugs--they just need to be better.
authors.affiliation: Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK. liam.smeeth@lshtm.ac.uk
authors.forename: Liam
authors.initials: L
authors.lastname: Smeeth
authors.forename: Ian
authors.initials: I
authors.lastname: Douglas
authors.forename: Richard
authors.initials: R
authors.lastname: Hubbard
mesh_terms: D016022:Case-Control Studies; D015986:Confounding Factors, Epidemiologic; D050723:Fractures, Bone / Q000517:prevention & control*; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000008:administration & dosage*; D012107:Research Design; D018570:Risk Assessment / Q000379:methods; D015983:Selection Bias
chemical_list: D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors