In the version of this article originally published, there was an error in the affiliation for Robert Tuba (Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Budapest, Hungary), which was listed as a present address, and an error in the second affiliation for Ki-Young Yoon (Present address: Ashland Specialty Ingredients, Bridgewater, NJ, USA), which was not listed as a present address. The changes have been made to the HTML and PDF versions of the article.