title: THE AGE AT MENARCHE IN POLISH GIRLS.
mesh_terms: D000293:Adolescent; D001699:Biometry; D002648:Child; D005260:Female; D006801:Humans; D008572:Menarche; D008598:Menstruation; D011044:Poland; D013223:Statistics as Topic
keywords: ADOLESCENCE; CHILD; MENSTRUATION; POLAND; STATISTICS