Letter by Bertoletti et al regarding article, "Anticoagulation and survival in pulmonary arterial hypertension: results from the Comparative, Prospective Registry of Newly Initiated Therapies for Pulmonary Hypertension (COMPERA)"
1 Université Jean-Monnet, Thrombosis Research Group, St. Etienne, France, INSERM, CIC-CIE3, St. Etienne, France, Centre Hospitalier Universitaire, Service de Médecine Vasculaire et Thérapeutique, St. Etienne, France.