Westhoff, Michael
Rickermann, M.
Franieck, E.
Littterst, P.
Baumbach, J. I.
Article History
Received: 27 November 2018
Revised: 15 January 2019
Accepted: 22 January 2019
First Online: 21 February 2019
Compliance with ethical standards
:
: JIBB declared to be an employee of a company producing spectrometers used. There are no other conflicts of interest.