1. 1st Cardiology Department, Hippokration Hospital, National and Kapodistrian University of Athens, Greece (A.S.A., A.X., G.L., A.M., K.T., C.V.).
2. Institute of Cardiovascular Science, University College London, United Kingdom (A.P.).
3. Inherited Cardiovascular Disease Unit, St Bartholomew’s Hospital, London, United Kingdom (A.P.).