Funding for this research was provided by:
Wilhelm Sander-Stiftung (2014.157.1)
Text and Data Mining valid from 2017-08-22
Received: 17 May 2017
Accepted: 15 August 2017
First Online: 22 August 2017
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the local ethics committee of the University of Tuebingen (code: 251/2012BO1).
: Informed consent was obtained from all patients included in this study.