1. MRC Mammalian Genetics Unit; Harwell Science and Innovation Campus; Oxfordshire OX11 0RD UK
2. University of Liverpool Small Animal Teaching Hospital; Leahurst, Chester High Road Neston CH64 7TE UK
3. University of Glasgow School of Veterinary Medicine; Bearsden Road Glasgow G61 1QH UK
4. HS Cardiology Ltd; Barnfield Farm Tunstall Carnforth LA6 2RU UK
5. The Hospital for Sick Children; 555 University Avenue Toronto Ontario M5G 1X8 Canada