[Pros and cons of the controlled clinical trials registry].
Ponce de León
Sergio
S
D002986:Clinical Trials as Topic / Q000592:standards / Q000706:statistics & numerical data; D006801:Humans; D020407:Internet; D008800:Mexico; D011643:Publishing / Q000592:standards; D012042:Registries; D012952:Societies; D014944:World Health Organization