Received: 13 September 2018
Accepted: 20 May 2019
First Online: 29 May 2019
Ethics approval and consent to participate
: Ethical approval was granted from Medical Research Ethics Committee (MREC) Malaysia (NMRR-12-105-11288). Informed consent had been waived by MREC as it involved only retrospective data collection from the medical records.
: Not applicable.
: The authors declare that they have no competing interests.