Prader-Willi Alliance of New York Represents the interests of individuals in New York State with Prader-Willi syndrome, their families, and the professionals who provide services to the Prader-Willi population. http://www.prader-willi.org

Prader-Willi Syndrome Association of Victoria (Australia) Includes details about the organization, a diagnosis/infant guide, a general guide, members stories and links. http://www.pws.asn.au

Williams Syndrome and Prader-Willi Syndrome Diagnostic assessment, selected treatment services and opportunities to participate in research from the Yale University Child Study Center. http://info.med.yale.edu/chldstdy/wspws

Prader-Willi Syndrome Association (USA) Characteristics include hypotonia, insatiable appetite, obesity if food intake is uncontrolled, hypogonadism and incomplete sexual development, developmental delays, variable degrees of mental retardation or functional retardation, short stature (adult), small hands and feet, mild dysmorphology, and behavior problems which can be severe. http://www.pwsausa.org/

Ontario Prader-Willi Syndrome Association OPWSA provides support and information to all those interested in finding out about this syndrome. A special emphasis on Canadian content. http://members.attcanada.ca/~opwsa/

Prader-Willi Syndrome - Suite101 A forum to provide a support base for PWS without having to join one of the national or international associations, and to make people more aware of PWS. http://www.suite101.com/welcome.cfm/prader_willi_syndrome

The Prader-Willi Syndrome Association (UK) Information and resources about this chromosomal disorder. http://www.pwsa-uk.demon.co.uk/

Gretton Homes Information about the organization that offers residential care for people with Prader-Willi Syndrome. http://www.gretton-homes.co.uk/

The New Jersey Chapter of the Prader-Willi Syndrome Association Includes news, important dates, fund raising, maps and links. http://www.pwsausa.org/nj/

The Prader-Willi Alliance for Research A non-profit group of volunteer families, friends and researchers aiming to raise funds for research into finding treatments for Prader-Willi Syndrome. http://www.pwsresearch.org/fpwr/index.htm

Fragile X Association of Australia Information on this disease, medical aspects, education, references, contacts and what's new in Australia http://www.fragilex.org.au/