Heart Rate Variability Biofeedback Reduces Symptoms of Depression And Anxiety in Depressed People Davide Pierini 1 , Petros Tzavaris 2 , Domenico Sgromo 3 , Carlo Prune; 3 , Chiara Cosen;no 3 (1) Keiron, Montreal (Canada) (2) Montreal Neurofeedback Center, Montreal (Canada) (3) University of Parma (Italy), Department of Clinical and Experimental Medicine, Clinical Psychology Unit