Use of responder threshold criteria to evaluate the response to treatment in the phase III CHEST-1 study - D'Armini,AM; Ghofrani,H-A; Kim,NH; Mayer,E; Morsolini,M; Pulido-Zamudio,T; Simonneau,G; Wilkins,MR; Curram,J; Davie,N; Hoeper,MM (JOURNAL OF HEART AND LUNG TRANSPLANTATION, 2015)