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Rainer Schnell
University of Duisburg-Essen, Methodology Research Unit. Lotharstr. 65, 47057 Duisburg, Germany.
Mark Trappmann
Institute for Employment Research, Regensburger Str. 104, 90478 Nuremberg, Germany and University of Bamberg, Germany
Tobias Gramlich
University of Duisburg-Essen, Methodology Research Unit, Lotharstr. 65, 47057 Duisburg, Germany.