1. Royal Alexandra Children's Hospital; Easten Road Brighton East Sussex UK BN2 5BE
2. Clinical Trials Unit; Medical Research Unit; Other Diseases Group 222 Euston Road London UK NW1 2DA
3. St George's, University of London; Community Health Sciences; Cranmer Terrace Tooting London UK SW17 ORE
4. CHU Sainte-Justine; Direction de la Recherche/ Research Centre; 3175 Cote Sainte-Catherine Montreal Québec Canada H3T 1C5