Affiliation: | Medical Centre Rijnmond-Zuid, Rotterdam, the Netherlands (P.C.A.M. Buijtels);University Medical Center Rotterdam, Rotterdam (P.C.A.M. Buijtels, H.A. Verbrugh);National Institute of Public Health and the Environment, Bilthoven, the Netherlands (M.A.B. van der Sande, D. van Soolingen);Medical Centre Alkmaar, Alkmaar, the Netherlands (C.S. de Graaff); St. Francis Hospital, Katete, Zambia (S. Parkinson); Vlietland Hospital, Schiedam, the Netherlands (P.L.C. Petit) |