Funding for this research was provided by:
National Science Foundation (RPHS/2016/CKDu 07)
UK Medical Research Council ((MR/P02386X/1)
Colt Foundation (-)
Received: 6 February 2019
Accepted: 6 June 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: The study is in accordance with Helsinki Declaration. The study protocol has been approved by the Ethics Committee of Colombo Medical Faculty (EC-17-031). Participants gave their informed written consent.
: Not applicable.
: The authors declare that they have no competing interest.