This article was originally published online with an incomplete funding number in the Acknowledgments. The sentence should have read: This work has been partially supported by the National Science Centre (grant decision No. DEC-2011/03/N/ST3/02950), the National Centre for Research and Development Grant No. IT13426, INNOTECH 157829, European Union within and IAPP project SINOPLE Grant No. 230765, and European Union funds by the European Social Fund

All online versions of the article were corrected on 16 April 2014.