N Galie, B. H Brundage, H. A Ghofrani, R. J Oudiz, G Simonneau, Z Safdar, S Shapiro, R. J White, M Chan, A Beardsworth, L Frumkin, R. J Barst and on behalf of the Pulmonary Arterial Hypertension and Response to Tadalafil (PHIRST) Study Group
Circulation 119 ( 22 ): 2894 - 2903 , 2009