Menstrual patterns in Upper Egypt.
D000367:Age Factors; D002648:Child; D004412:Dysmenorrhea / Q000453:epidemiology; D004534:Egypt; D005260:Female; D006801:Humans; D008572:Menarche; D008598:Menstruation; D011293:Premenstrual Syndrome / Q000453:epidemiology; D013997:Time Factors