Erratum to: Complex Intell. Syst. DOI 10.1007/s40747-015-0001-5

When the article was published, unfortunately the Creative Commons Attribution (CC-BY) 4.0 license information was missing in the article and the article was not published as open access. This has now been corrected.

The correct copyright line is as follows:

© The Author(s) 2015. This article is published with open access at Springerlink.com

The correct license text is as follows:

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.