First Author:   David Stadelmann University of Bayreuth and CREMA david.stadelmann@uni-bayreuth.de   Universitätsstr. 30 Bayreuth, 95440, Germany   +49 (0) 9 21 - 55 60 77(Phone) +49 (0) 9 21 - 55 60 77(Fax) http://www.entwicklung.uni-bayreuth.de Second Author: Marco Portmann University of Fribourg marco.portmann@unifr.ch   Bd. de Pérolles 90 Fribourg, 1700, Switzerland       Third Author: Reiner Eichenberger University of Fribourg and CREMA reiner.eichenberger@unifr.ch   Bd. de Pérolles 90 Fribourg, 1700, Switzerland