Study design and participants
In this two-center retrospective cohort study, patients who delivered
between January 1, 2018 and August 30, 2019 were enrolled from the First
Affiliated Hospital of Chongqing Medical University and
Qinghai Red Cross Hospital. All
patients were asked to independently complete the questionnaires within
about 6 weeks after delivery. With
informed consent, the answers of the patients can be used here.