1. Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
2. Optimal Data Analysis LLC, San Diego, CA, USA
3. Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
4. Department of Medicine, Division of General Internal Medicine and Geriatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
5. Department of Dermatology, Faculty of Medicine and Surgery, University of Catania, Catania, Italy