Text and Data Mining valid from 2016-03-01
Received: 16 November 2015
Accepted: 9 January 2016
First Online: 1 March 2016
Compliance with ethical standards
: The authors have no relevant conflict of interest to disclose. The study was not financially supported by any funding source. The design, collection, analysis, and the interpretation of data, plus the writing and the publication of the manuscript, were done by the authors without participation or influence from any funding source.