Factors often not considered before a multicenter trial is started.
Hardy
E
E
Department of Obstetrics and Gynecology, Faculty of Medical Sciences, Universidade Estadual de Campinas, Säo Paulo, Brazil.
D006801:Humans; D007258:Informed Consent; D015337:Multicenter Studies as Topic / Q000592:standards*; D012107:Research Design; D018401:Sample Size; D014956:Writing