This document is an update of an earlier overview from May 2011 (RIVM 118/2011). It was prepared as part of a research project commissioned by the Ministry of Infrastructure and Water Management and the Ministry of Social Affairs and Employment of the Netherlands. The information that forms the basis for this summary was obtained from searches of governmental and scientific websites, scientific publications, policy summaries by other organisations and personal contacts with experts in the countries in question. The information was last updated in the period from January to July 2017.