[The trend of the smoking habit among Bierzo adolescents].
Vega Alonso
A T
AT
D000293:Adolescent; D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology*; D013030:Spain / Q000453:epidemiology
Tendencia del hábito de fumar entre los adolescentes bercianos.