Article History
Received: 14 June 2018
Accepted: 30 September 2018
First Online: 20 October 2018
Compliance with ethical standards
:
: FC and DB served as consultants and speakers for Grunenthal. GC served as speaker for Bayer and MM served as consultant and speaker for Bayer and Kyowa Kirin.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable.