Text and Data Mining valid from 2018-05-17
Received: 5 February 2018
Revised: 12 April 2018
Accepted: 17 April 2018
First Online: 17 May 2018
Compliance with ethical guidelines
: J. Hadem, R. Rossnick, B. Hesse, M. Herr, M. Hansen, A. Bergmann, G. Kensah, C. Maess, H. Baraki, P. Kümpers, A. Lukasz, and I. Kutschka declare that they have no competing interests.
: The study adhered to the ethical guidelines of the 1975 Declaration of Helsinki, was approved by the local ethics committee (approval number 51/15), and was registered at the German Clinical Trials Register (DRKS study number 00008855). All patients provided informed consent prior to study entry.