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Author Joachim Graf declares that he has no conflict of interest. Author Alexander N. Sokolov declares that he has no conflict of interest. Author Eva-Maria Grischke declares that she has no conflict of interest. Author Andreas D. Hartkopf declares that he has no conflict of interest. Author Markus Hahn declares that he has no conflict of interest. Author Martin Weiss declares that he has no conflict of interest. Author Harald Abele declares that he has no conflict of interest. Author Harald Seeger declares that he has no conflict of interest. Author Sara Yvonne Brucker 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. 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