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Ethical approval for this retrospective study was granted by the Ethics Commission of University of Aachen, Germany, No. 171\/08.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"For this type of study, formal consent is not required.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}