Occurrence and causes of occupational asthma in South Africa – results from SORDSA’s occupational asthma registry, 1997 – 1999 Author: Esterhuizen TM, Hnizdo E, Rees D. Source: S Afr Med J. 2001;91(6):509-513. Babalwa Jekwa2019-04-03T12:06:55+02:00Dec 31st, 2001| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail