[Naturalistic studies to evaluate the effectiveness of medicines after being put on the market: why, when and how?].
Soto
J
J
Departamento de Economía de la Salud, Pharmacia & Upjohn, S.A., Madrid.
Sacristán
J A
JA
Galende
I
I
D002986:Clinical Trials as Topic; D004345:Drug Industry; D004363:Drug Utilization; D007880:Legislation, Drug