Transparency
Declaration of financial/other interest
B.C. has disclosed that she received an honorarium from Grünenthal GmbH to attend the meeting in Rome.
CMRO peer reviewers may have received honoraria for their review work. The peer reviewers on this manuscript have disclosed that they have no relevant financial relationships.
Acknowledgement
The authors thank Derrick Garwood Ltd, Cambridge, UK, for editorial support, which was sponsored by Grünenthal GmbH, Aachen, Germany.