Study design
COA
This randomized controlled trial was conducted between September 2021 and March 2022 at the antenatal care clinic, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand. The protocol was approved by the Ramathibodi Hospital Institutional Review Board (COA, MURA2021/748) and complied with the Declaration of Helsinki. The study was registered with the Thai Clinical Trials Registry, TCTR20210917001 (17/09/2021).