1. Department of Clinical Laboratory, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, 250012 Shandong, China
2. Department of Neurosurgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250033, China
3. Department of Clinical Laboratory, The Ninth People’s Hospital of Qingdao, Qingdao, Shandong 266000, China