Scientific Reports 6: Article number: 35919; published online: 24 October 2016; updated: 09 December 2016

In this Article the author contributions section is incomplete:

“V.G. planned experiments, performed experiments, analyzed data and wrote the manuscript; C.C. planned experiments, analyzed data and critically read the manuscript; C.G. planned and performed the ERG experiments, analyzed data and critically read the manuscript; E.N. provided technical support, analyzed data and critically read the manuscript; C.F. provided fundamental reagents and critically read the manuscript; M.C. planned experiments, analyzed data and critically edited the manuscript; E.S. planned experiments, analyzed data and wrote the manuscript”.

Should read:

“V.G. planned experiments, performed experiments, analyzed data and wrote the manuscript; C.C. planned experiments, analyzed data and critically read the manuscript; C.G. planned and performed the ERG experiments, analyzed data and critically read the manuscript; I.P. planned and performed the ERG experiments, analyzed data and critically read the manuscript; E.N. provided technical support, analyzed data and critically read the manuscript; C.F. provided fundamental reagents and critically read the manuscript; M.C. planned experiments, analyzed data and critically edited the manuscript; E.S. planned experiments, analyzed data and wrote the manuscript”.