1. Department of Pathology, Tianjin Union Medical Center, Tianjin 300121, P.R. China
2. Graduate School, Tianjin Medical University, Tianjin 300070, P.R. China
3. Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, P.R. China
4. Department of Clinical Laboratory, Tianjin Medical University Cancer Institution and Hospital, Tianjin 300090, P.R. China