This article was originally published with incorrect affiliations for Marco G. Casteleijn.
The affiliation was originally given as Faculty of Biological and Environmental Sciences, Helsinki University of Technology, Finland.
The correct affiliation is Faculty of Biological and Environmental Sciences, Helsinki University, Finland.
The affiliation was originally given as Industrial Biotechnology and Food Solutions, VTT, Finland.
The correct affiliation is Industrial Biotechnology and Food Solutions, VTT Technical Research Centre of Finland, Finland.
The errors have been corrected and the online HTML and PDF versions updated.
The author apologises for this error.