Division of Medicine, Akershus University Hospital, Lorenskog, Norway and Center for Heart Failure Research, Institute of Clinical Medicine, University of Oslo, Oslo, Norway. Department of Cardiovascular Research, IRCCS - Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy. Department of Anesthesia and Critical Care, Azienda-Ospedaliero Universitaria S. Luigi Gonzaga, Orbassano, Italy. Dipartimento di Oncologia, Universita degli Studi di Torino, Turin, Italy. Department of Medical Sciences, Uppsala University, Uppsala, Sweden. Department of Cardiovascular Research, IRCCS - Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy. Institute for Experimental Medical Research, Ulleval and Center for Heart Failure Research, Institute of Clinical Medicine, University of Oslo, Oslo, Norway. Department of Anesthesia and Critical Care, Ospedale Citta di Sesto San Giovanni, Sesto San Giovanni, Italy. Ospedale della Misericordia, Grosseto, Italy. Department of Anesthesiology, Emergency and Intensive Care Medicine, University of Gottingen, Gottingen, Germany. Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Milan, Italy. Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Universita degli Studi di Milano, Milan, Italy. Department of Cardiovascular Research, IRCCS - Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy. Division of Medicine, Akershus University Hospital, Lorenskog, Norway and Center for Heart Failure Research, Institute of Clinical Medicine, University of Oslo, Oslo, Norway.