[1] Univ Munich, Grad Sch Syst Neurosci, Munich, Germany
[2] Univ Minnesota, Med Ctr, Audiol & Aural Rehabil, Minneapolis, MN 55455 USA
[3] Univ Iowa, Dept Commun Sci & Disorders, Iowa City, IA 52242 USA
[4] Indiana Univ, Dept Speech & Hearing Sci, Bloomington, IN 47405 USA