Erratum

After publication of this work [1], we noted that we inadvertently failed to include the complete list of all co-authors. The full list of authors has now been updated. The Authors' contributions and Competing interests section modified accordingly. We are publishing this erratum to update the author list, which is as follows:

Vittorio Branchi, Philipp Lingohr, Winfried A Willinek, Edwin Bölke, Alexander Semaan, Hui Zhou, Glen Kristiansen, Günter Klöppel, Jörg C Kalff, Nico Schäfer and Hanno Matthaei