You can search Chinese literature on selective mutism.
http://search.cnki.net/index.aspx
As long as I know, selective mutism has been studied at least since 1979 in China.
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[related links]
http://ci.nii.ac.jp/en/
http://ci.nii.ac.jp/
CiNii is provided by National Institute of Informatics. You can search Japanese Literature on selective mutism.
CAMPUSMON.COM
CAMPUSMON.COM is Korean site. You can search Korean Literature on selective mutism.
