Text and Data Mining valid from 2019-11-02
Received: 13 June 2019
Accepted: 21 October 2019
First Online: 2 November 2019
Compliance with ethical standards
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
: This study complied with the guidelines set out in the Declaration of Helsinki and was approved by the Ethics Committee of Sittard-Heerlen, the Netherlands (14-N-168; NTR 4928).
: All patients gave their written informed consent prior to enrolment.