[Evaluation in health interventions: looking for balance between internal validity of results and external validity of conclusions].
Gérvas
Juan
J
Pérez Andrés
Cristina
C
D002986:Clinical Trials as Topic / Q000592:standards*; D006801:Humans; D011634:Public Health / Q000592:standards*; D016032:Randomized Controlled Trials as Topic / Q000592:standards