1. Ipyana F. Mwandelile, Namibia Field Epidemiology and Laboratory Training Programme,  Windhoek, Namibia, fipyana@afenet.net
2. Dianah M. Ewaga, University of Namibia, Faculty of Health Sciences and Veterinary Medicine, School of Nursing and Public Health, Oshakati, Namibia, dewaga@unam.na