Once this agreement is signed by the corresponding author, changes in springer`s authorship or in the order of listed authors are not accepted. The author is prompted to use the corresponding DOI for the article (go to the link options in the article, then to OpenURL and use the link with the DOI). The articles disseminated on www.springerlink.com are indexed, abstract and referenced by numerous abstraction and information services, bibliographic networks, subscription agencies, library networks and consortia. Publishing an article with Open Access leaves the copyright to the author. You can publish your Open Access article in Springer`s Open Choice program or in one of our SpringerOpen magazines. The article is published under the Creative Commons Attribution License (CC-BY), which allows users to read, copy, distribute, and create derivative works from it as long as the author of the original work is cited. . . .