1. Al-Quds Nutrition and Health Research Institute, Al-Quds University, Jerusalem 20760, Palestine
2. Faculty of Medicine, Al-Quds University, P.O. Box 51000, Jerusalem, Palestine
3. Department of Social Medicine, School of Medicine, University of Crete, P.O. Box 2208, 71003 Iraklion, Crete, Greece
4. Jean Mayer USDA Human Nutrition Research Centre, Tufts University, 711 Washington Street, Boston, MA 02111, USA
5. Faculty of Medicine, An-Najah National University, P.O. Box 7, Nablus, West Bank, Palestine