1. Cardiology Unit and Echocardiography; Madonna del Soccorso Hospital; San Benedetto del Tronto and Politecnica delle Marche University; Ancona Italy
2. Referral Center for Cardiomyopathies; Careggi University Hospital; Florence Italy
3. Tufts Medical Center; Boston Massachusetts
4. Division of Cardiovascular Disease; University of Alabama at Birmingham; Birmingham Alabama