1. Division of Dermatology, Department of Medicine; University of Alberta; Edmonton Alberta Canada T6G 2G3
2. Goldman, Butterwick, Groff, Fabi, and Wu Cosmetic Laser Dermatology; San Diego California 92121
3. Division of Dermatology, Department of Medicine; University of Hong Kong; Hong Kong SAR China
4. Wellman Center for Photomedicine; Massachusetts General Hospital, Harvard Medical School; Boston Massachusetts