Zahraničné kontakty
Federation of European Williams Syndrome ; Country: (FEWS)
СИНДРОМ ВИЛЬЯМСА (williamsov syndróm) ; Country: УКРАЇНА(Ukrajina)
Občanské sdružení Willík ; Country: Česká republika
Afrham section Syndrome de Williams ; Country: Belgium
vzw Williams-Beuren syndroom ; Country: Belgium
Dansk Forening for Williams Syndrom ; Country: Denmark
Autour des Williams ; Country: France
Williams-Beuren-Syndrom Bundesverband e.V. ; Country: Germany
Magyar Williams Szindróma Társaság ; Country: Hungary
Williams Syndrome Association of Ireland ; Country: Ireland
Federatie van ouderverenigingen ; Country: Netherlands
Norsk Forening for Williams Syndrom ; Country: Norway
Asociatia Williams Syndrome ; Country: Romania
Associacion Sindrome Williams de España (ASWE) ; Country: Spain
Williams Syndromforeningen I Sverige ; Country: Sweden
Association Suisse Syndrome de Williams ; Country: Switserland