Text and Data Mining valid from 2018-07-17
Received: 10 August 2017
Accepted: 2 July 2018
First Online: 17 July 2018
: The authors declare no competing interests. All procedures performed in this study 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. The datasets analyzed during the current study are available from the corresponding author on reasonable request.