aDepartment Internal Medicine 1, Klinikum Saarbrücken, Saarbrücken, Germany
bDepartment of Clinical Medicine, Danish Pain Research Center, Aarhus University, Aarhus, Denmark
cDepartment of Neurology, Aarhus University Hospital, Aarhus, Denmark
dPain Research and Nuffield Division of Anaesthetics, University of Oxford, The Churchill, Oxford, United Kingdom
Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.
Received May 18, 2018
Accepted May 21, 2018