Text and Data Mining valid from 2019-08-15
Received: 22 May 2019
Accepted: 21 July 2019
First Online: 15 August 2019
Ethics approval and consent to participate
: The study protocol was approved by the Research and Ethics Committee of School of Medical Sciences, Universiti Sains Malaysia [USM/JEPeM/15020063] which complies with the Declaration of Helsinki. All the subjects signed the written informed consents before being included in the study.
: Not applicable.
: The authors declare that they have no competing interests.