Affiliation: | 1. Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine,146‐92, Dogok‐dong, Seoul, 135‐720, Korea;2. Department of Dermatology, Seoul Medical Center, Seoul, Korea;3. Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA 15261, USA;4. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea |