1. Department of Nursing, Shenzhen Hospital, Southern Medical University, Shenzhen, Guangdong, 518101, P.R. China
2. School of Nursing, Southern Medical University, Guangzhou, Guangdong, 510515, P.R. China
3. Reproductive Center, The First Affiliated Hospital of Shantou University Medical College, Shantou, Guangzhou, Guangdong, 515041, P.R. China