1. C.J. Jolly is at Centenary Institute, The University of Sydney, Sydney NSW 2006, Australia
2. A.J.L. Cook is at UMR 218 Centre National de la Recherche Scientifique/Institut Curie, 75248 Paris, France
3. J.P. Manis is at Joint Program in Transfusion Medicine and Department of Laboratory Medicine, Children's Hospital Boston, and Department of Pathology, Harvard Medical School, Boston, MA 02115