1. Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha, China
2. Clinical Research Center, The Third Xiangya Hospital, Central South University, Changsha, China
3. Department of Surveying and Remote Sensing Science, School of Geosciences and Info-physics, Central South University, Changsha, China
4. Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China
5. Faculty of Life Sciences & Medicine, King’s College London, London, UK