aDepartment of Cardiovascular Medicine, Heart, Vascular and Thoracic Institute, Kaufman Center for Heart Failure Treatment and Recovery, Cleveland Clinic, Cleveland, Ohio, USA

bDepartment of Cardiovascular Medicine, Cleveland Clinic Florida, Weston, Florida, USA

Correspondence to Trejeeve Martyn, MD, Department of Cardiovascular Medicine, Heart, Vascular and Thoracic Institute, 9500 Euclid Avenue, J3-4 Cleveland, OH 44195, USA. Tel: +1 216 704 2458;. fax: +1 216 445 6165; e-mail: [email protected]