by VAN DER WERF, Tjip S, STIENSTRA, Ymkje, ASIEDU, Kingsley, JOHNSON, R. Christian, PHILLIPS, Richard, ADJEI, Ohene, FLEISCHEJ, Bernhard, WANSBROUGH-JONES, Mark H, JOHNSON, Paul D. R, PORTAELS, Francoise, VAN DER GRAAF, Winene T. A
Published in Bulletin of the World Health Organization (01.10.2005)