Authors:
Name 	Birgit Laggner 
birgit.laggner@ti.bund.de
Affiliation 	Thünen-Institute of Rural Studies, Braunschweig
Country 	Germany
Principal contact for editorial correspondence.
 
Name 	Natascha Orthen 
natasch.orthen@ti.bund.de
Affiliation 	Thünen-Institute of Rural Studies, Braunschweig
Country 	Germany