Frequency and Predictors of Hyperkalemia in Patients ≥60 Years of Age With Heart Failure Undergoing Intense Medical Therapy - Stefano Muzzarelli; Micha T. Maeder; Stefan Toggweiler; Hans Rickli; Fabian Nietlispach; Barbara Julius; Thilo Burkard; Matthias Pfisterer; Hans‐Peter Brunner‐La Rocca (2011)