Received: 10 February 2020
Accepted: 28 May 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The study was conducted at the Pain Research and TMS Laboratory, Department of Physiology, All India Institute of Medical Sciences (AIIMS) New Delhi, India. Human Ethics committee of the AIIMS, New Delhi (Ref No: IESC/T-251/15.06.2013) approved the research protocol in 2013. The study was also registered in ICMR-CTRI; India (Ref No: CTRI/2013/12/004228). All procedures performed during study involving human participants were in accordance with the ethical standards of the Human Ethics committee of the AIIMS, New Delhi. All the participants provided written informed consent. All the participants were enrolled only after getting ethical approval.
: Consent to publish was also obtained from all the participants included in the study.
: Authors declare no competing interests concerning the work reported in this manuscript.