1. Faculty of Economics and Business Administration, Friedrich Schiller University Jena , Carl-Zeiss-Str. 3, Jena 07743, Germany . e-mail: uwe.cantner@uni-jena.de ; e-mail: matthias.menter@uni-jena.de
2. Department of Business & Management, Center for Integrative Innovation Management, University of Southern Denmark , Campusvej 55, Odense M 5230, Denmark . e-mail: mkalth@sam.sdu.dk
3. Maastricht University, UNU-MERIT , Boschstraat 24, Maastricht 6211 AX, The Netherlands . e-mail: p.mohnen@maastrichtuniversity.nl