Article History
Received: 20 August 2019
Revised: 28 November 2019
Accepted: 13 December 2019
First Online: 26 December 2019
Compliance with ethical standards
: Ute Mathis declares that she has no conflict of interest. Marita Feldkaemper declares that she has no conflict of interest. Min Wang declares that she has no conflict of interest. Frank Schaeffel declares that he has no conflict of interest. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.