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About the article
Published Online: 2017-07-01
Published in Print: 2017-07-01
Ethical issues: Procedures were proposed to each participant and written informed consent in accordance to the Declaration of Helsinki was obtained. Institutional Review Board: Ethics Committee of the Faculty of Medicine of the Ruhr University Bochum, Germany Chairman: Prof. Dr. M. Zenz; Gesundheitscampus 33, 44801 Bochum, Germany; No. 4501-12; approval: 23 Oct 2012.
Conflict of interest: CMF: received a sponsorship award for young pain scientists 2012 from Janssen-Cilag GmbH. Further, she received payments for clinical lectures from OrionPharma and Grünenthal Group 2013, all unrelated to the current study and relationships in the past. GJ: none known. EPZ: received consultancy fees from Mundipharma, MSD, Janssen-Cilag and Grünenthal. EPZ has a grant pending from Mundipharma. She has received payment for lectures from Mundipharma, Lilly, MSD, Pfizer and Grünenthal, and travel/accommodation/meetings expenses unrelated to other activities from Mundipharma. Funding was not related to the present research. PZ: none known.
Funding: Costs of this study (e.g. expendable materials, proband fees) were obtained from institutional sources.
Authors’ contributions: CMF: drafted ethical proposal and manuscript, performed statistics; GJ: collected data, did statistical analyses; EMPZ: responsible for concept, gave advice and made critical revisions; PKZ: responsible for concept, participated in drafting the manuscript.