1. Center for Dermatoepidemiology Providence VA Medical Center Providence Rhode Island USA
2. 1st Department of Dermatology and Venereology National and Kapodistrian University of Athens, A. Syggros Hospital Athens Greece
3. Department of Dermatology Brown University Providence Rhode Island USA
4. George Washington University School of Medicine Washington District of Columbia USA
5. Unit of Endocrinology, Diabetes mellitus and Metabolism 2nd Department of Obstetrics and Gynecology Athens Greece
6. School of Medicine University of Colorado Denver Aurora Colorodo USA
7. Dermatology Service, US Department of Veterans Affairs Denver Colorodo USA
8. Department of Dermatology University of Colorado School of Medicine Aurora Colorodo USA