Thangarajah, F. http://orcid.org/0000-0002-1458-7303
Heilmann, J.
Malter, W.
Kunze, S.
Marnitz, S.
Mallmann, P.
Wenz, F.
Sperk, E.
Article History
Received: 23 December 2017
Accepted: 30 December 2017
First Online: 15 January 2018
Compliance with ethical standards
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: FT, JH, RS, SK, SM, PM and ES do not have any conflict of interest to declare. WM works as a consultant for Carl Zeiss AG. FW receives research funding from Carl Zeiss AG and works as a consultant for this company.