Retraction Note: GPS Solut (2017) 21:1805–1816 https://doi.org/10.1007/s10291-017-0654-1

The Editor in Chief has retracted this article. An internal investigation into this article was carried out by University College London and found that the results of this article were not reproducible and concluded that the results were fabricated. The Editor in Chief has therefore lost confidence in the validity of the data and the results of this article. Paul D. Groves agrees to this retraction. Mounir Adjrad does not agree to this retraction.