Article History
Received: 11 February 2019
Accepted: 6 August 2019
First Online: 14 August 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: Ethical approval was given by the ethical committee of the medical faculty of the University of Münster, Münster, Germany.
: Informed consent was obtained from all individual participants included in the study.