1. Department of Pediatrics, Shu Yang Union Medical College Hospital, Suqian, Jiangsu 223600, P.R. China
2. Department of Clinical Laboratory, The 82nd Hospital of Chinese People's Liberation Army, Huaian, Jiangsu 223001, P.R. China
3. Department of Postgraduates, BengBu Medical College, Bengbu, Anhui 233004, P.R. China