Lingjun Xu1, Xiaofeng He2,
Xiaoping Wang1
1 Department of Pain Management, The First Affiliated
Hospital, Jinan University, Guangzhou, 510632, China;
2 Department of Institute of Evidence-based medicine,
Heping Hospital Affiliated to Changzhi Medical College, Shanxi,
Changzhi, 046000, China
Correspondence: Xiaoping Wang (txp2938@jnu.edu.cn)