Text and Data Mining valid from 2019-05-17
Received: 28 November 2018
Accepted: 3 May 2019
First Online: 17 May 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethics Committee of Ulm University.
: Conduction of the study was in accordance with the ethical standards of the institutional ethical committee and with the 1964 Helsinki declaration and its later amendments. This article does not contain any studies animals performed by any of the authors.
: No informed consent was obtained.