Text and Data Mining valid from 2017-07-14
Received: 2 April 2017
Accepted: 26 June 2017
First Online: 14 July 2017
Compliance with ethical standards
: On behalf of all authors, the corresponding author states that there is no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the official IRB Committee of the hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.