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Robert Schilz declares that he has no conflict of interest. Andreas Patzak declares that he has no conflict of interest. Linda Rausch declares that she has no conflict of interest. Nicolaus C. Netzer declares that he has no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"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 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study protocol has been reviewed and approved by the ethical review board of the Bavarian Physician Chamber on the 22.05.2014. 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