Text and Data Mining valid from 2019-09-06
Received: 4 June 2019
Accepted: 22 August 2019
First Online: 6 September 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by our local Institutional Review Board and all patients signed written, informed consent.