Balan, Shamala http://orcid.org/0000-0001-8424-7729
Hassali, Mohamed Azmi Ahmad http://orcid.org/0000-0001-8269-885X
Mak, Vivienne S. L. http://orcid.org/0000-0002-1325-5809
Article History
Received: 16 May 2018
Accepted: 31 August 2018
First Online: 14 September 2018
Compliance with ethical standards
:
: This literature review is exempted from ethical review as it involves the use of existing data or records that contains only de-identifiable data about human beings.
: All the authors of this study declare that they have no competing interest.