Quantitative assessment of right ventricular volumes in severe chronic thromboembolic pulmonary hypertension using transthoracic three-dimensional echocardiography: changes due to pulmonary thromboendarterectomy - Menzel,T.; Kramm,T.; Burckner,A.; Morh-Kahaly,S.; Mayer,E.; Meyer,J. (Eur J Echocardiographr, 2002)