title: Clinical research of kidney diseases 1: researchable questions and valid answers.
authors.affiliation: Clinical Epidemiology Unit, Faculty of Medicine, Memorial University of Newfoundland, Canada, and Divisione di Nefrologia, Azienda Istituti Ospitalieri di Cremona, Italy. p.ravani@ospedale.cremona.it
authors.forename: Pietro
authors.initials: P
authors.lastname: Ravani
authors.forename: Patrick S
authors.initials: PS
authors.lastname: Parfrey
authors.forename: Bryan
authors.initials: B
authors.lastname: Curtis
authors.forename: Brendan J
authors.initials: BJ
authors.lastname: Barrett
mesh_terms: D015982:Bias; D035843:Biomedical Research; D006801:Humans; D007674:Kidney Diseases / Q000473:pathology*; D015203:Reproducibility of Results; D012107:Research Design; D012494:Sampling Studies