Health‐related quality of life of patients with severe heart failure. A cross‐sectional multicentre study - Fotos, Nikolaos V; Giakoumidakis, Konstantinos; Kollia, Zoi; Galanis, Petros; Copanitsanou, Panagiota; Pananoudaki, Evangelia; Brokalaki, Hero (Scandinavian journal of caring sciences, 2013)