Philippe Unger1, Eric Stoupel2, Rachid Briki2, Vincent Ninane3. 1. Department of Cardiology, Centre Hospitalier Universitaire Saint-Pierre, 322, rue Haute, Brussels 1000, Belgium punger@ulb.ac.be. 2. Department of Cardiology, Centre Hospitalier Universitaire Saint-Pierre, 322, rue Haute, Brussels 1000, Belgium. 3. Department of Pneumology, Centre Hospitalier Universitaire Saint-Pierre, 322, rue Haute, Brussels 1000, Belgium.