1. Hebei North University, Zhangjiakou, Hebei, China (mainland)
2. Department of Ultrasonography, Central Hospital of Haining, Haining, Zhejiang, China (mainland)
3. Department of Ultrasonography, Wangjing Hospital, Chinese Academy of Traditional Chinese Medicine, Beijing, China (mainland)
4. Department of Ultrasonography, Zhejiang Provincial People’s Hospital (People’s Hospital of Hangzhou Medical College), Hangzhou, Zhejiang, China (mainland)
5. Department of Ultrasonography, Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China (mainland)