Xiaomeng Xu1,2, Li Tian3, Zhimian Zhang4. 1. Medical Examination Center of Qilu Hospital of Shandong University, No.107 Culture West Road, Jinan, 250012, Shandong, China. 2. Department of Health Management, Jining NO.1 People's Hospital, Jining, 272011, Shandong, China. 3. Department of Critical Care Medicine, Jining NO.1 People's Hospital, Jining, 272011, Shandong, China. 4. Medical Examination Center of Qilu Hospital of Shandong University, No.107 Culture West Road, Jinan, 250012, Shandong, China. zhangzhimian0064@sina.com.