1. Department of Hematology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
2. Department of Stomatology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
3. College of Basic Medicine, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China