Clinical research of kidney diseases 1: researchable questions and valid answers.
Ravani
Pietro
P
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
Parfrey
Patrick S
PS
Curtis
Bryan
B
Barrett
Brendan J
BJ
D015982:Bias; D035843:Biomedical Research; D006801:Humans; D007674:Kidney Diseases / Q000473:pathology*; D015203:Reproducibility of Results; D012107:Research Design; D012494:Sampling Studies