用“epidemiological study”造句大全,epidemiological study造句
Thesethreemaincategoriesofepidemiologicalstudymayeachrequire,asapreliminaryphase,afourthandratherdifferentapproach-thatis,amethodstudy.Comment:inapreviousepidemiologicalstudy,theprevalenceofdysmenorrh...