Ethics Statement

TB Theodor Baars
UN Ursula Neumann
MJ Mona Jinawy
SH Stefanie Hendricks
JS Jan-Peter Sowa
JK Julia Kälsch
MR Mona Riemenschneider
GG Guido Gerken
RE Raimund Erbel
DH Dominik Heider
AC Ali Canbay
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The study protocol conformed to the ethical guidelines of 1975 Declaration of Helsinki and was approved by the Institutional Review Board (Ethik-Kommission der Medizinischen Fakultät der Universität Duisburg-Essen; Germany; reference number 15-6356-BO). Due to the retrospective nature of the study, the Institutional Review Board cancelled the need for written informed consent.

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