Received: 26 August 2019
Accepted: 19 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: This study was carried out in accordance with the Declaration of Helsinki. Ethical approval was obtained from the Human Research Ethics Committee, Universiti Sains Malaysia (USM/JEPeM/18090420), Medical Research and Ethics Committee, Ministry of Health Malaysia (NMRR-18-2675-43980(IIR)) and written approval from the Kelantan State Health Department.
: Not applicable.
: The authors declare that they have no competing interests.