The European Federation of Williams Syndrome (FEWS) is the official association of national organisations across Europe which are actively involved in supporting people with WS.
Williams Syndrome Foundation UK is run by parents, for parents, and is supported by a panel of eminent medical and professional advisers.
Association for rare diseases in children based in Serbia. The association is very active in raising awareness about the problems of rare diseases, providing therapy and medical equipment, as well as improving the position in society both of those suffering from rare diseases and their families.
Official website of the Serbian Ministry of Health