[American Thoracic Society American Thoracic Society 2012 International Conference, May 18-23, 2012 • San Francisco, California - ()] B19. UPDATE IN CLINICAL TRIALS OF PULMONARY ARTERIAL HYPERTENSION - Proof-Of-Concept Study To Investigate The Efficacy, Hemodynamics And Tolerability Of Terguride Vs. Placebo In Subjects With Pulmonary Arterial Hypertension: Results Of A Double Blind, Randomised, Prospective Phase IIa Study