1. Department of Plastic and Reconstructive Surgery; Institute for Human Tissue Restoration, Yonsei University College of Medicine, Seoul, Korea
2. Department of Dermatology, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
3. Department of Pathology; Yonsei University College of Medicine; Seoul Korea
4. Department of Bioengineering, College of Engineering; Hanyang University; Seoul Korea