COMT Val 158 Met polymorphism is associated with cognitive flexibility in a signal discrimination task in schizophrenia. - Neuhaus AH; Opgen-Rhein C; Urbanek C; Hahn E; Ta TM; Seidelsohn M; Strathmann S; Kley F; Wieseke N; Sander T; Dettling M (Pharmacopsychiatry, 2009)