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Stefan Neumeier
Institute for Rural Studies, The Thünen Institute, German Federal Institute for Rural Areas, Forestry and Fisheries, Bundesallee 50, 38116 Braunschweig, Germany
Kim Pollermann
Institute for Rural Studies, The Thünen Institute, German Federal Institute for Rural Areas, Forestry and Fisheries, Bundesallee 50, 38116 Braunschweig, Germany