基金This work was supported by a grant from the Department of Science and Technology, Sichuan, P.R. China
This work was supported by a grant from the Department of Science and Technology, Sichuan, China. We would like to thank JIN Mei, LUO Dan, SANG Mu, WANG Mu, and Luo-sang-Jian-cai from Medical School of Tibet university for their assistance with the data collection.