Conflict of interest
Mohamad Norkahfi Razali declares that he has no conflict of interest. Marina Mat Baki declares that she has no conflict of interest. Kew Thean Yean declares that he has no conflict of interest. Mohd Razif Mohamad Yunus declares that he has no conflict of interest.
Ethical Approval
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed Consent
Informed consent was obtained from all individual participants included in the study.