TY - JOUR AU - Nickel, N; Golpon, H; Greer, M TI - The prognostic impact of follow-up assessments in patients with idiopathic pulmonary arterial hypertension JO - Eur Respir J VL - 39 PY - 2012 DO - 10.1183/09031936.00092311 SP - 589 EP - 596 N1 - et al. ER -