Balling, Horst
Article History
Revised: 9 January 2019
Accepted: 12 January 2019
First Online: 12 September 2019
Compliance with ethical guidelines
:
: H. Balling declares that he has no competing interests.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975 (in its most recently amended version). Informed consent was obtained from all patients included in the study. Additional informed consent was obtained from all individual participants for whom identifying information is included in this article.