title: Secular trend in the sexual maturation of Chinese girls.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002681:China / Q000208:ethnology; D005260:Female; D006723:Hong Kong; D006801:Humans; D012737:Sex Factors; D012741:Sexual Maturation; D012959:Socioeconomic Factors