1. School of Nursing, Youjiang Medical University for Nationalities, Baise, Guangxi 533000, P.R. China
2. Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
3. Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China