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A.\u00a0Hubert, Z.\u00a0Moussaoui, R.\u00a0Bekeredjian, F.\u00a0Vitinius and K.-H.\u00a0Ladwig declare that they have no competing interests.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"For this article no studies with human participants or animals were performed by any of the authors. All studies mentioned were in accordance with the ethical standards indicated in each case.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}