_:vb50937698 . _:vb50937698 . _:vb50937698 "url:http://en.wikipedia.org/wiki/Dystonia"^^ . _:vb50937698 "A focal dystonia that affects a single muscle or small group of muscles in the hand resulting from involuntary muscular contractions."^^ . _:vb50937698 . _:vb50937698 . _:vb50937698 .