1. Department of Surgery and Biomedical Engineering; Beckman Laser Institute and Medical Clinic; University of California; Irvine 92612 California
2. Department of Dermatology; Xijing Hospital, Fourth Military Medical University; Xi'an 710032 China
3. Department of Biomedical Engineering; University of California; Irvine 92617 California
4. Department of Statistics; University of Akron; Akron 44325 Ohio
5. Department of Family and Community Medicine; Northeast Ohio Medical University; Rootstown 44272 Ohio
6. Department of Pathology and Laboratory Medicine; University of California; Irvine 92697 California
7. Department of Dermatology, Brigham and Women's Hospital; Harvard Institute of Medicine; Boston 02115 Massachusetts