The pulmonary arterial hypertension quality enhancement research initiative: comparison of patients with idiopathic PAH to patients with systemic sclerosis-associated PAH

Clements P, Tan M, McLaughlin V, Oudiz R, Tapson V, Channick R, Rubin L, Langer A. The pulmonary arterial hypertension quality enhancement research initiative: comparison of patients with idiopathic PAH to patients with systemic sclerosis-associated PAH. Ann Rheum Dis. 2012; 71(2): 249-52.