Text and Data Mining valid from 2018-08-10
Received: 6 April 2018
Accepted: 10 July 2018
First Online: 10 August 2018
Compliance with ethical standards
: S.H., L.F., T.B., R.B. declare no conflicts of interest. W.V. serves as a consultant for the Nordic Institute for Chiropractice and Clinical Biomechanics, Odense, Denmark. P.T.M. served as consultant for Iba Pharma and received an honorarium for a lecture from Desitin Arzneimittel GmbH.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.