Todd, David J.; Hughes, Anne E.; Ennls, Kevin T.; Ward, Alana J.; Burrows, Desmond; C.Nevin, Norman; Todd David J.; Department of Medical Genetics, Queen's University of Belfast BT9 7AB and BT 12 6AB; Department of Dermatology, Royal Victoria Hospital; Hughes Anne E.; Department of Medical Genetics, Queen's University of Belfast BT9 7AB and BT 12 6AB; Ennls Kevin T.; Department of Medical Genetics, Queen's University of Belfast BT9 7AB and BT 12 6AB; Ward Alana J.; Department of Medical Genetics, Queen's University of Belfast BT9 7AB and BT 12 6AB; Burrows Desmond; Department of Dermatology, Royal Victoria Hospital; C.Nevin Norman; Department of Medical Genetics, Queen's University of Belfast BT9 7AB and BT 12 6AB