1. Department of Radiology, Urumqi Stomatological Hospital, Urumqi, Xinjiang Uygur Autonomous Region 830011, P.R. China
2. Department of General Special Requirements, Affiliated Tumor Hospital of Xinjiang Medical University, Urumqi, Xinjiang Uygur Autonomous Region 830011, P.R. China
3. Department of Oncology II, Dalian Fifth People's Hospital, Dalian, Liaoning 116021, P.R. China