Olsson, Karen M;Delcroix, Marion;Ghofrani, H Ardeschir;Tiede, Henning;Huscher, Doerte;Speich, Rudolf;Grünig, Ekkehard;Staehler, Gerd;Rosenkranz, Stephan;Halank, Michael;Held, Matthias;Lange, Tobias J;Behr, Juergen;Klose, Hans;Claussen, Martin;Ewert, Ralf;Opitz, Christian F;Vizza, C Dario;Scelsi, Laura;Vonk-Noordegraaf, Anton;Kaemmerer, Harald;Gibbs, J Simon R;Coghlan, Gerry;Pepke-Zaba, Joanna;Schulz, Uwe;Gorenflo, Matthias;Pittrow, David;Hoeper, Marius M.Response to letters regarding article, "Anticoagulation and survival in pulmonary arterial hypertension: results from the Comparative, Prospective Registry of Newly Initiated Therapies for Pulmonary Hypertension (COMPERA)"..Circulation.2014.130.12.e110-2