1. Department of Emergency Medicine and Chest Pain Center, Affiliated Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
2. Department of Emergency and Critical Care Medicine, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250014, P.R. China
3. Department of Emergency Medicine, The Second People's Hospital of Dongying, Dongying, Shandong 257335, P.R. China
4. Department of Emergency Medicine, Yidu Center Hospital of Weifang, Weifang, Shandong 262500, P.R. China
5. Department of Central Laboratory, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
6. Department of Clinical Laboratory Medicine, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China