Text and Data Mining valid from 2017-11-02
Received: 28 August 2017
Accepted: 4 October 2017
First Online: 2 November 2017
Compliance with ethical guidelines
: B. Goeggel Simonetti, U. Fischer and S. Jung were supported by the Swiss National Science Foundation (SPUM-Grant 33CM30-124119). U. Fischer and J. Gralla received speaker fees from Covidien and are consultants for Medtronic. J. Hulliger, E. Mathier, H. Sarikaya, J. Slotboom, G. Schroth, P. Mordasini and M. Arnold declare that they have no competing interests.
: The local ethics committee approved the study and the patients or their next of kin gave written informed consent.