1. Department 1 Analytical Chemistry, Reference Materials, Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Str. 11, 12489 Berlin, Germany
2. Department 4 Materials & Environment, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
3. Section for Genetics and Evolutionary Biology (Evogene), Department of Biosciences, University of Oslo, P.O.
Box 1066 Blindern, 0316 Oslo, Norway