Anja Zupan Mežnar1, David Žižek1, Nathan Mewton2. 1. Cardiology Department, University Medical Centre Ljubljana, Zaloška Cesta 7, 1000Ljubljana, Slovenia. 2. Heart Failure Department, Hôpital Cardio-Vasculaire Louis Pradel, Clinical Investigation Center Inserm 1407, CarMeN Inserm 1060, Hospices Civils de Lyon, Claude Barnard University Lyon 1, Lyon, France.