1. School of Basic Medical Sciences, Guilin Medical University, Guangxi, Guilin, China;
2. Department of Foreign Languages, Guilin Medical University, Guangxi, Guilin, China;
3. Department of Histology and Embryology, Guilin Medical University, Guangxi, Guilin, China; and
4. Department of Pathophysiology, Guilin Medical University, Guangxi, Guilin, China