Received: 27 July 2018
Accepted: 24 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: Ethical clearance was obtained from the Clinical Research Centre (CRC) Penang General Hospital. Permission to proceed with the study protocol and access the raw data was obtained from the state level relevant authorities. Research approval was also taken from prison authorities and Ministry of Health, Malaysia prior to the study. Data was de-identified and consent was waived due to retrospective nature of study.
: Not applicable.
: The authors declare that they have no competing interests.