Ethics approval and consent to participate
RECRUITMENT
M.R. and K.W. designed the study, monitored progress, undertook recruitment, data collection and interventions and decided on the analytic strategy. S.B. and Y.W. revised the writing. All authors reviewed the manuscript.None.Not applicable.All procedures followed the Helsinki Declaration, and all participants provided written informed consent. The Ethics Review Committee of the Faculty of Medicine, University of Colombo, Sri Lanka, approved the study on 20th of June 2019 under the application number UCP-AL-15-319. The study was registered in the Sri Lanka Clinical Trials Registry (managed by the Sri Lanka Medical Association) on 6th of September 2019, (registration number SLCTR/2019/029) under the application number APPL/2019/028.