1. Department of Ultrasonography, The Second People’s Hospital of Liaocheng, Liaocheng, Shandong, China (mainland)
2. Department of Ultrasonography, Wucheng Traditional Chinese Medicine (TMC) Hospital, Wucheng, Shandong, China (mainland)
3. Department of Ultrasonography, Zhucheng People’s Hospital, Zhucheng, Shandong, China (mainland)
4. Departmeng of Oncology, Yidu Central Hospital of Weifang, Weifang, Shandong, China (mainland)
5. Department of Ultrasonography, Jining No. 1 People’s Hospital, Jining, Shandong, China (mainland)