title: Have some beneficial effects of hydroxychloroquine been overestimated? Potential biases in observational studies of drug effects: comment on the article by Pons-Estel et al.
authors.forename: Evelyne
authors.initials: E
authors.lastname: Vinet
authors.forename: Sasha
authors.initials: S
authors.lastname: Bernatsky
authors.forename: Samy
authors.initials: S
authors.lastname: Suissa
mesh_terms: D015982:Bias; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D006801:Humans; D006886:Hydroxychloroquine / Q000627:therapeutic use*; D007668:Kidney / Q000187:drug effects*; D008181:Lupus Nephritis / Q000188:drug therapy* / Q000453:epidemiology*; D016016:Proportional Hazards Models
chemical_list: D004791:Enzyme Inhibitors; D006886:Hydroxychloroquine