1. Emergency Department, The Sixth Affiliated Hospital, South China University of Technology, Foshan City, Guangdong, P.R. China
2. Neurology Department, Medical School, Yan’an University, Yan’an City, Shanxi, P.R. China
3. Obstetric Department, The Sixth Affiliated Hospital, South China University of Technology, Foshan City, Guangdong, P.R. China