Materials and methods
This retrospective cross-sectional study was approved by the ethical
committee of The Fourth Affiliated Hospital of Zhejiang University
School of Medicine (08/22/2019, No. K20190046). The requirements for
informed consent were exempted. An electronic search of the radiology
information system was performed in two hospitals between July 2018 and
June 2019 and included all consecutive female inpatients who underwent
pelvic MRI. The demographic information was collected from the medical
records.