1. Chair for International Economics, Ruhr University of Bochum, Bochum, D-44801, Germany
2. Kiel Institute for the World Economy, Hindenburgufer 66, Kiel, D-24105, Germany
3. Department of Business Administration, Chair for Applied Statistics and Empirical Economics, University of Bremen, Bremen, D-28359, Germany
4. Department of Economics and Business Administration, Chair for Empirical Economics, Chemnitz University of Technology, Chemnitz, D-09126, Germany
5. FOM Hochschule für Oekonomie & Management, University of Applied Sciences, Herkulesstr. 32, Essen, D-45127, Germany