1. CIELI, University of Genoa, Genoa, Italy
2. Maritime Institute, Faculty of Law and Criminology, Ghent University, Ghent, Belgium
3. Faculty of Sciences, Antwerp Maritime Academy, Antwerp, Belgium
4. Department of Transport and Regional Economics, Faculty of Business and Economics, University of Antwerp, Antwerp, Belgium
5. Department of Economics, University of Genoa, Genoa, Italy