1. Department of Dermatology, The Second Xiangya Hospital, Central South University, Changsha, China;
2. Department of Dermatology, Yale School of Medicine, New Haven, CT, USA;
3. Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, PA, USA;
4. Department of Surgery, Hospital of the University of Pennsylvania, Philadelphia, PA, USA;
5. Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA