1 Department of Ultrasound, The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China.
2 Clinical Medical College of Acupuncture & Moxibustion and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China.
3 Department of Gynecology, Zhengzhou Second Hospital, 450006, China.
4 Department of Ultrasound, The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China. Electronic address: gztcmcs@126.com.