1. Institute of Aging Research, School of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang 311121, P.R. China
2. Department of Dermatology, Affiliated Hospital, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
3. Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P.R. China
4. Information Centre, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China