1. Department of Internal Medicine, School of Medicine, Shiraz University of Medical Sciences, P.O. Box 71345-1836, Shiraz, Iran
2. Department of Periodontology, School of Dentistry, Shiraz University of Medical Sciences, P.O. Box 71345-1836, Shiraz, Iran
3. School of Medicine, Shiraz University of Medical Sciences, P.O. Box 71345-1836, Shiraz, Iran