[US]
Selective Mutism Group Inc
Selective Mutism Foundation
[UK]
Selective Mutism Information and Research Association
[Germany]
Mutismus Selbsthilfe Deutschland e. V.
[Japan]
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There are no self-help groups of selective mutism in Japan.
What is worse is that few Japanese teachers, therapists and physicians are familiar with this complex disorder.
I suppose that is because there are no Japanese researchers specializing in selective mutism. The only Japanese book on selective mutism written by professional is Bamen Kanmokuzi No Shinri To Shido (Psychology and Guidance of Children with Selective Mutism,) published in 1994. Most Japanese, except for a handful of people who can read English, rely on findings that are over a decade ago. Myth persists. For example, "Selective mutism is caused by abuse, neglect or trauma."
Index of SM in Japan