Prevalence is age-adjusted to the 1960 Egyptian population24 between the ages of 10 and 50 years. *Lower Egypt: governorates Kafr el Sheik, Gharbia, Menoufia, Damietta, Dahkalia, Qaulioubia, Behira, and Sharkia. †Middle Egypt: governorates Giza, Fayoum, Beni Sweif, Menya. ‡Upper Egypt: governorates Assiut, Sohag, Quena, Aswan.