1. Federal University of Applied Administrative Sciences , Brühl , Germany
2. Düsseldorf Institute for Competition Economics , Düsseldorf , Germany
3. European Central Bank , Frankfurt am Main , Hessen , Germany
4. Monopolies Commission , Bonn , Germany
5. Hamburg University of Applied Sciences , Berliner Tor 5, 20099 Hamburg , Germany
6. Leuphana University Lüneburg , Lüneburg , Germany