1 Cheeloo College of Medicine, Shandong University, Jinan, 250012, Shandong, China.
2 Intensive Care Unit, Central Hospital Affiliated to Shandong First Medical University, 105 Jiefang Road, Jinan, 250013, Shandong, People's Republic of China.
3 Admission Preparation Center, Taian City Central Hospital, Taian, 271000, Shandong, China.
4 Shandong First Medical University, Taian, 271016, Shandong, China.
5 Intensive Care Unit, Central Hospital Affiliated to Shandong First Medical University, 105 Jiefang Road, Jinan, 250013, Shandong, People's Republic of China. shenggao163@163.com.