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Article History

Received: 31 May 2019

Accepted: 31 May 2019

First Online: 4 June 2019

Compliance with ethical standards

:

: T. Schlomm declare no potential conflicts of interest.

: This Letter is in accordance with the ethical standards with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Human participants or animals were not involved.

: An ethical approval/informed consent was unnecessary because this letter is based on analysis of the results of previous published studies. In these studies, informed consent was obtained from all individual participants.