Funding for this research was provided by:
Ministry of Health and Welfare, Government of India (Dy.No.C-707)
Received: 13 September 2020
Accepted: 14 May 2021
First Online: 31 July 2021
: The study was approved by the Institutional Ethics Committee of the Coordinating Centre, ICMR-NCDIR. Approval no: NCDIR/IEC/2017/4 dated 03 February 2017. Every implementing agency obtained their ethics approval from their own Institutional Ethics Committee before starting the survey. Official permission and communication were obtained from state and local health authoritites prior to survey. All the study participants were enrolled only after obtaining written informed consent.
: Not applicable.
: None declared.