[Double-blind. The bias control in the performance of clinical trials. Contradictions, lacks and implications].
Rodríguez Martín
José Luis
JL
Centro Cochrane Iberoamericano. Servei d'Epidemiologia Clínica i Salut Pública. Hospital de la Santa Creu i Sant Pau. Barcelona. Spain. jrodriguezma@hsp.santpau.es
Casado Collado
Alfonso
A
D015982:Bias; D002986:Clinical Trials as Topic / Q000592:standards*; D004311:Double-Blind Method