[1] Western Gen Hosp, Comparat & Dev Genet Sect, MRC, Human Genet Unit, Edinburgh EH4 2XU, Midlothian, Scotland
[2] Univ Newcastle Upon Tyne, Inst Human Genet, Int Ctr Life, Newcastle Upon Tyne NE1 3BZ, Tyne & Wear, England
[3] Victor Chang Cardiac Res Inst, Sydney, NSW 2010, Australia