title: Letter by Roik et al Regarding Article, "Novel Angiographic Classification of Each Vascular Lesion in Chronic Thromboembolic Pulmonary Hypertension Based on Selective Angiogram and Results of Balloon Pulmonary Angioplasty".
authors.affiliation: Department of Internal Medicine and Cardiology, Medical University of Warsaw, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Roik
authors.affiliation: Department of Internal Medicine and Cardiology, Medical University of Warsaw, Poland.
authors.forename: Dominik
authors.initials: D
authors.lastname: Wretowski
authors.affiliation: Department of Internal Medicine and Cardiology, Medical University of Warsaw, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Pruszczyk
mesh_terms: D000792:Angiography; D000800:Angioplasty, Balloon; D015906:Angioplasty, Balloon, Coronary; D002908:Chronic Disease; D006801:Humans; D006976:Hypertension, Pulmonary; D011651:Pulmonary Artery; D011655:Pulmonary Embolism; D016896:Treatment Outcome