Funding for this research was provided by:
Institut Pengurusan dan Pemantauan Penyelidikan, Universiti Malaya (PG057-2015A)
Text and Data Mining valid from 2019-11-16
Received: 18 June 2019
Accepted: 14 October 2019
First Online: 16 November 2019
Change Date: 7 December 2019
Change Type: Correction
Change Details: Revised Funding Information.
Compliance with ethical standards
: Ethical approvals for this study was obtained from the Medical Research and Ethics Committee (MREC) Ministry of Health Malaysia (Ref. No. NMRR-14-1466-23315 [IIR] dated 7 September 2015) and Medical Ethics Committee of University Malaya Medical Centre (Ref. No. 201411-802 dated 2 November 2014).
: The authors declare that they have no conflicts of interest.