Funding for this research was provided by:
Ministry of Higher Education, Malaysia (ERGS/1/2012/SKK09/UKM/01/3)
Text and Data Mining valid from 2019-02-19
Received: 14 October 2018
Accepted: 28 January 2019
First Online: 19 February 2019
Compliance with ethical standards
: This study was approved by the ethics committee of the UKM Medical Centre, Malaysia.
: The authors declare that they have no conflict of interest.