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Ioannis Tsogkas, Daniel Behme, Veit Rohde, and Dorothee Mielke declare that they have no conflicts of interest. Marios Nikos Psychogios declares receiving speakers\u2019 honoraria from Siemens.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Compliance with ethical standards"}},{"value":"The study was approved by the local ethics committee (Number 22\/11\/12). A patient\u2019s consent for treatment was obtained according to the individual institutional guidelines. Due to a retrospective analysis of prospectively collected data additional informed consent was deemed unnecessary. This study was conducted according to the principles of the Helsinki Declaration []. This study was not funded.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Compliance with ethical standards"}}]}}