Funding for this research was provided by:
National Natural Science Foundation of China (U1704175, 81571696)
Health and Family Planning Commission of Henan Province (SB201901093)
Science and Technology New Star Project of Chinese Ultrasound Doctors Association (KJXX2019006)
Received: 2 September 2020
Accepted: 8 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: All study protocol and image procedures have been approved by the Animal Care and Use Committee of Xinxiang Medical College.
: Not applicable.
: The authors have declared that no competing interest exists.