Received: 13 May 2021
Accepted: 27 August 2021
First Online: 16 September 2021
: This study was conducted under the large cohort study in Anuradhapura District, Sri Lanka, Generating Evidence for Ending Preventable Maternal Deaths: the Rajarata Pregnancy Cohort (RaPCo). Ethical clearance to conduct the RaPCo study was obtained from the Ethics Review Committee of the Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka (Reference no: ERC/2019/07). In accordance with the Declaration of Helsinki, all participants were informed that this study was voluntary and that data would be handled confidentially. All participants gave their informed written consent.
: Not applicable since individual data publication is not intended in this study.
: The authors declare that they have no competing interests.