Clazosentan (AXV-034343), a selective endothelin A receptor antagonist, in the prevention of cerebral vasospasm following severe aneurysmal subarachnoid hemorrhage: results of a randomized, double-blind, placebo-controlled, multicenter phase IIa study. - Vajkoczy,P.; Meyer,B.; Weidauer,S. (J Neurosurg, 2005)