Colorectal Research Center, Shiraz University of Medical Science, Shiraz, Iran;
Department of Epidemiology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran;
Department of Epidemiology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran;
Research Center for Health Sciences. Shiraz University of Medical Sciences, Shiraz, Iran;
Department of Community Medicine, Medical School, Shiraz University of Medical Sciences, Shiraz, Iran;
Department of Community Medicine, Medical School, Shiraz University of Medical Sciences, Shiraz, Iran;
Department of Communicable Diseases, Shiraz university of Medical Science, Shiraz, Iran;