1. Key Laboratory of Medical Cell Biology in Inner Mongolia, Clinical Medical Research Center, The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
2. Department of Gastrointestinal Surgery, The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, P.R. China
3. Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, P.R. China