1. Key Laboratory of Radiobiology (Ministry of Health), School of Public Health, Jilin University, Changchun, China.
2. Department of Diagnostic Imaging, Center for Radiological Research, Weihai Chest Hospital, Weihai, China.
3. Department of Radiation Oncology, Center for Radiological Research, The 2nd Hospital Affiliated to Jilin University, Changchun, China.