[Why are so few clinical trials run in primary care?].
Grandes
G
G
Unidad de Investigaci n de Atenci n Primaria, Servicio Vasco de Salud, Vizcaya.
D002986:Clinical Trials as Topic / Q000379:methods / Q000706:statistics & numerical data*; D006801:Humans; D011320:Primary Health Care / Q000706:statistics & numerical data*