Funding for this research was provided by:
Technische Universität Dresden
Article History
Received: 6 November 2019
Accepted: 29 January 2020
First Online: 24 February 2020
Compliance with ethical standards
: The paper meets ethical standards. An ethical assessment is not necessary since this is only an (literature) review without any patient data.
: There are no potential conflicts of interest or any financial or personal relationships with other people or organizations that could inappropriately bias conduct and findings of this study.