Erratum

Unfortunately, after publication of this article [1], it was noticed that part of the ‘Acknowledgements’ section was missing. The following sentence should have been added to the ‘Acknowledgements’ section:

“This study has been developed within the PhD Programme in International Relations and European Integration of the Universitat Autònoma de Barcelona (UAB, Spain). We would also like to thank the comments of Prof. Jordi Bacaria (UAB).”

The full correct Acknowledgements section can be seen here.