1. Heart and Lung Center, Helsinki University Hospital, Meilahti Tower Hospital, PL 340, 00029 HUS Helsinki, Finland
2. Heart Failure Unit, Department of Internal Medicine, Hospital Sao Francisco Xavier, Centro Hospitalar Lisboa Ocidental, Estrada do Forte do Alto do Duque, 1449-005 Lisboa, Portugal
3. Department of Cardiology, Hospital de Santa Maria, Centro Hospitalar Lisboa Norte, Av. Prof. Egas Moniz, 1649-035 Lisboa, Portugal
4. Department of Cardiology, Institute of Medical Sciences, Uppsala University, Akademiska sjukhuset, Ing.40, 5 tr, 751 85 Uppsala, Sweden