Text and Data Mining valid from 2015-07-28
Received: 6 July 2015
Accepted: 7 July 2015
First Online: 28 July 2015
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
: Informed consent was obtained from all individual participants included in the study. For this type of study formal consent is not required.