Depression in paroxysmal and persistent atrial fibrillation patients: a cross-sectional comparison of patients enroled in two large clinical trials. - von Eisenhart Rothe AF; Goette A; Kirchhof P; Breithardt G; Limbourg T; Calvert M; Baumert J; Ladwig KH (Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, 2014)