Yan Li1, Jinzhi Li2, Jing Zhang2, Guoliu Ye3, Zhengmei Zhou4. 1. Department of Pathophysiology, Bengbu Medical College, Bengbu, China. 2. Department of Nursing, Bengbu Medical College, Bengbu, China. 3. Department of Gynecology, The First Affiliated Hospital of Bengbu Medical College, and Obstetrics, Bengbu, China. 4. Teacher Development Center, Bengbu Medical College, Bengbu, China.