Researcher

Year

Criteria

Grade

Objective and goals

Study context

Sampling

Methodology

Data

The results of the study are validated

Ramnarain & Hlatswayo

2018

/

/

/

/

/

/

A

Dublin et al.

2014

/

/

/

/

/

/

A

Agbo & Isa

2017

/

/

/

/

/

/

A

Avery & Kassam

2011

/

/

/

/

/

/

A

Alabdulkareem

2016

/

/

/

/

/

/

A

Wills et al.

2014

/

/

/

/

/

/

A

Lee et al.

2018

/

/

/

/

/

/

A

Schabort et al.

2018

/

/

/

/

/

/

A

Kalonde

2017

/

/

/

/

/

/

A

Veloo et al.

2013

/

/

/

/

/

/

A