[On Quality of clinical trials published in Spain on asthma in comparison to trials in English language journals].
Pérez Fernández
J A
JA
D002986:Clinical Trials as Topic / Q000592:standards*; D005060:Europe; D006801:Humans; D010506:Periodicals as Topic / Q000706:statistics & numerical data*; D011643:Publishing / Q000706:statistics & numerical data*; D011786:Quality Control; D013030:Spain; D011795:Surveys and Questionnaires