1. Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
3. Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China