1 Cardiovascular Department, Center for Diagnosis and Treatment of Cardiomyopathies, Azienda Sanitaria Universitaria Integrata (ASUITS), University of Trieste, Via P. Valdoni 7, 34100 Trieste, Italy.
2 Centre for Heart Muscle Disease, Institute of Cardiological Sciences, University College London and St. Bartholomew's Hospital, Gower St, Bloomsbury, London WC1E 6BT, UK.