1. David Geffen School of Medicine University of California Los Angeles Los Angeles California USA
2. Department of Dermatology University of California Los Angeles Los Angeles California USA
3. Department of Medicine Statistics Core, David Geffen School of Medicine University of California Los Angeles California USA
4. Jacobs School of Medicine and Biomedical Sciences University at Buffalo Buffalo New York USA
5. Department of Dermatology University of Arkansas for Medical Sciences Little Rock Arkansas USA
6. Department of Dermatology University of Southern California Los Angeles California USA