Lijun Liu1, Jianliang Zhu2, Lin Yang2, Yan Zhang2. 1. Department of Emergency and Critical Care Medicine, Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, China. Email: lijunliusz@hotmail.com. 2. Department of Emergency and Critical Care Medicine, Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, China.