[1] Univ London Imperial Coll Sci Technol & Med, London, England
[2] Univ Newcastle, Newcastle, NSW 2308, Australia
[3] Univ Exeter, Exeter EX4 4QJ, Devon, England
[4] Queen Mary Coll, London, England
[5] Univ Cambridge, Cambridge CB2 1TN, England
[6] Radcliffe Infirm, Oxford OX2 6HE, England
[7] Wellcome Trust Ctr Human Genet, Oxford, England