Received: 25 March 2019
Accepted: 19 May 2020
First Online: 23 June 2020
Ethics approval and consent to participate
: This study was approved by the Medical Research and Ethics Committee (MREC), Ministry of Health Malaysia, with the registration number NMRR-17-1266-36001. All subjects were informed about the aim of the study, study procedures and restrictions as well as side-effects that may occur from participation. Voluntary participation and freedom to withdraw from the study at any time were duly conveyed to them and written informed consent from all subjects were obtained prior to commencement of the study.
: Written consent to publish from subjects was obtained during informed consent process where they were informed that no personal information will appear in any report or publication.
: The authors declare that they have no competing interests.