Updates are available Correction dated 2021-04-02

Article History

Received: 16 July 2019

Accepted: 12 March 2020

First Online: 16 April 2020

Change Date: 2 April 2021

Change Type: Correction

Change Details: A Correction to this paper has been published:

Change Details: https://doi.org/10.1186/s40854-021-00241-5

Competing interests

: I confirm that I have read Springer Open’s guidance on competing interests and have included a statement indicating that <b>none of the authors have any competing interests in the manuscript.</b> The authors of this manuscript are the Postgraduate Doctoral (PhD) candidates from Universiti Teknologi Malaysia (UTM) and their thesis supervisors. Since this study used secondary data from the official source of Malaysia’s Department of Statistics, we therefore decide to <b>not share the data</b> to the public.