[1] Univ KwaZulu Natal, Dept Behav Med, Dept Behav Med, Pietermaritzburg, South Africa
[2] Ft Napier Hosp, Pietermaritzburg, South Africa
[3] Univ KwaZulu Natal, Dept Behav Med, Pietermaritzburg, South Africa
[4] Ft Napier Hosp, POB 370, ZA-3200 Pietermaritzburg, South Africa