1. Northwest Institute of Plateau Biology, College of Life Science, Chinese Academy of Sciences, Xining, Qinghai, P.R. China
2. Key Laboratory of Tibetan Medicine Research, College of Life Science, Chinese Academy of Sciences, Xining, Qinghai, P.R. China
3. Key Laboratory of Tibetan Medicine Research of Qinghai Province, Xining, Qinghai, P.R. China
4. College of Life Science, University of Chinese Academy of Sciences, Beijing, P.R. China