Article History
Received: 21 November 2022
Accepted: 16 February 2023
First Online: 4 April 2023
Declarations
:
: The authors declare no conflicts of interest associated with this manuscript.
: All the images were collected based on the system construction guidelines for the collection of medical images published by the Japan Association for Medical Informatics. The study was conducted in accordance with the World Medical Association Declaration of Helsinki. The study protocol conformed to the ethical guidelines of the 1975 Declaration of Helsinki. Informed consent was waived for retrospectively collected data in the medical records, including ultrasound images, if they were anonymized. The study was approved by the ethics committees of all participating institutions.