1. Great Ormond Street Hospital for Children, London WC1N 3JH, UK
2. Animal and Plant Health Agency, Weybridge, New Haw, Addlestone, Surrey KT15 3NB, UK
3. University of Bologna, Via Zamboni, 33, 40126 Bologna BO, Italy
4. Teeside University, Campus Heart, Middlesbrough TS1 3BX, UK