1. Department of Behavioural Medicine, Nelson R Mandela School of Medicine, University of Kwazulu-Natal and Midlands Hospital, P. 0. Box 370, Pietermaritzburg, 3200, South Africa
2. Department of Behavioural Medicine, Nelson R Mandela School of Medicine, University of Kwazulu-Natal and Midlands Hospital, Pietermaritzburg, South Africa