In the above article, a source of Financial Support was omitted. The Financial Support statement should read as follows:
Financial Support
This study was funded by the European Commission Seventh Framework Programme. Grant agreement number is 602645. The views expressed in this publication are those of the authors and not necessarily those of the European Commission or Queen Mary University of London. The Polish part of this study was co-financed by the Polish Ministry of Science and Higher Education (agreement number 3153/7.PR/2014/2 to conduct a co-financed international project no. W112/7.PR/2014).