1. Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Plastic and Reconstructive Surgery, Severance Hospital, Institute for Human Tissue Restoration, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Dermatology and Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.