Text and Data Mining valid from 2020-01-03
Received: 28 May 2019
Accepted: 23 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: Ethical clearance was obtained from the Institute ethics committee of PGIMER, Chandigarh. (No: Histo/13/1567) Informed written consent was taken from all the participants.
: Not applicable.
: Author Jarnail Singh Thakur is an Associate Editor for BMC Public Health. None of the authors have any competing interests.