Department of Public Health, Faculty of Medicine and Health Sciences, An-Najah National University, PO. Box 7, Nablus, West Bank, Palestine. a.hanani@najah.edu. Department of Nutrition and Food Technology, Faculty of Agriculture and Veterinary Medicine, An-Najah National University, PO. Box 7, Tulkarm, West Bank, Palestine. Department of Nutrition and Food Technology, Faculty of Agriculture, Hebron University, PO. Box 40, Hebron, West Bank, Palestine. Medicine Program, Faculty of Medicine and Health Sciences, An-Najah National University, PO. Box 7, Nablus, West Bank, Palestine.