Funding for this research was provided by:
World Health Organization
Received: 25 January 2021
Accepted: 10 February 2021
First Online: 11 August 2021
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Ethics Committee of Ananthapuri Hospitals and Research Institute, Trivandrum, Kerala, India (No. AHRI/ EC/42/Oct/2016) and by the Ethical Review Committee of the World Health Organization, Geneva (No. ERC.0002847). Written informed consent was obtained from all study participants.
: Informed consent included the consent for publication of study findings.
: The authors declare that they have no competing interests.