Affiliation: | (1) MRC Human Ecogenetics Research Unit, Department of Human Genetics, School of Pathology, South African Institute for Medical Research and University of Medicine, P.O. Box 1038, Johannesburg, South Africa;(2) Nuffield Department of Medicine, John Radeliffe Hospital, Oxford, UK;(3) Department of Paediatrics and Child Health, Johannesburg Hospital, Johannesburg, South Africa;(4) Section of Medical Genetics, University Hospital of Wales, Heath Park, Cardiff, UK;(5) Institute of Child Health, University of London, 30 Guilford Street, London, UK |