1. Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-2 dong, Songpa-gu, Seoul 138-736, Korea
2. Department of Dermatology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
3. Laboratory for Tissue Engineering and Regeneration, School of Stomatology, Shandong University, Jinan, Shandong, China, 44-1 Wenhua Xi Road, Jinan, Shandong 250012, China
4. Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, Massachusetts, United States
5. Asan Institute for Life Sciences, Seoul, Korea
6. Cellpark Clinic, Seoul, Korea
7. Department of Dermatology, Seoul National University Hospital, Seoul, Korea
8. Department of Dermatology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 110-744, Korea