[Secondary sex characteristics among Mexican boys 9 to 16 years of age. Horizontal study].
D000293:Adolescent; D000367:Age Factors; D001827:Body Height; D002648:Child; D006801:Humans; D008297:Male; D008800:Mexico; D012016:Reference Values; D012727:Sex Characteristics; D012741:Sexual Maturation
Caracteres sexuales secundarios en niños mexicanos de 9 a 16 años. Estudio transversal.