The original manuscript was published with some errors in the author affiliations.
The 2nd affiliation listed was published as:
2Institut de Mathématiques de Bourgogne, UMR 5584, Institut Universitaire de France, Université Bourgogne Europe, 9 avenue Alain Savary, Dijon Cedex, France
The correct affiliation is:
2Institut Universitaire de France
Furthermore, Nikola Stoilov was listed as being affiliated with institution 2 but he is in fact affiliated with institution 1: Institut de Mathématiques de Bourgogne, UMR 5584, Université Bourgogne Europe, 9 avenue Alain Savary, Dijon Cedex, France.
The original manuscript has now been updated online.
The publishers apologise for this error.