Upfront combination therapy with sildenafil and ambrisentan in patients with chronic thromboembolic pulmonary hypertension
William Salibe-Filho1, Tulio Martins Vieira1, José Leonidas Alves-Junior1, Yally Priscila Pessôa Nascimento1, Luiza Sarmento Tatagiba1, Caio Julio Cesar Fernandes1, Carlos Viana Poyares Jardim1, Mario Terra-Filho1, Rogerio Souza1