[1
]
Discipline of Occupational and Environmental Health, School of Nursing and Public
Health, University of KwaZulu-Natal, Durban, South Africa.
[2
]
Discipline of Paediatrics and Child Health, School of Clinical Medicine, College of
Health Sciences, University of KwaZulu-Natal, Durban, South Africa.
[3
]
Department of Occupational and Environmental Medicine, Sahlgrenska University Hospital
and University of Gothenburg, Gothenburg, Sweden.