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Article History

Received: 10 January 2018

Accepted: 31 March 2018

First Online: 19 April 2018

Compliance with ethical standards

:

: 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. In the study a retrospective chart review but no specific study-related investigations were performed in the cohort. Therefore, in accordance with the ethics committee no informed consent was obtained in the framework of the study.

: No conflict of interest.