Text and Data Mining valid from 2019-05-14
Received: 14 February 2019
Accepted: 3 May 2019
First Online: 14 May 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This was a prospective single-center case-control study in compliance with the Declaration of Helsinki and approved by the local ethical committee.
: Every patient gave his/her informed consent.