1. The 2nd Affiliated Hospital of Medical School, Xi'an Jiao To, Imaging Center, China.
2. The 1st Affiliated Hospital of Medical School, Xi'an Jiao To, Imaging Center, Chian.
3. Beijing ChaoYang Hospital, Capital Medical University, Imaging Center, China.
4. Medical College of Xi'an Jiaotong University, Department of Health Statistics, China.