Additional ContributorsJeffrey P Callen, MD Professor of Medicine (Dermatology), Chief, Division of Dermatology, University of Louisville School of MedicineJeffrey P Callen, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, American College of Physicians, and American College of RheumatologyDisclosure: Amgen Honoraria Consulting; Abbott Honorari