[1] Guangzhou Med Univ, Dept Anaesthesiol, Guangzhou Women & Childrens Med Ctr, Guangzhou, Guangdong, Peoples R China
[2] Univ Hong Kong, Dept Anaesthesiol, Dept Anaesthesiol, Shenzhen, Peoples R China
[3] Southern Med Univ, Dept Anaesthesiol, Southern Hosp, Guangzhou, Guangdong, Peoples R China
[4] Univ Hong Kong, Dept Anaesthesiol, Hong Kong, Hong Kong, Peoples R China