1 Department of Ultrasound Medicine, the First People's Hospital of Linhai City, Linhai, China.
2 Department of Ultrasound Medicine, Women's Hospital School of Medicine Zhejiang University, Hangzhou, China.
3 Zhejiang Provincial Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China.