[The 9-year-old child. Epidemiological study].
D002648:Child; D004812:Epidemiologic Methods; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D008603:Mental Health; D002666:Psychology, Child; D012959:Socioeconomic Factors; D013557:Switzerland
L'enfant de 9 ans. Etude épidémiologique.