1. Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois2Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
2. Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
3. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
4. Department of Dermatology, Baylor University Medical Center, Dallas, Texas
5. Department of Dermatology, University of California, San Francisco