| http://www.w3.org/ns/prov#value | - Ambrose(1997) looked at CWS who recover & those who persist, analyzed family trees of 66 CWS soon after onset, followed for several years, grouped into persistent & recovered, M/F ratio of 7:1 (persistent), 2:1 (recovered), persistence also ran in families, both types transmitted by genes, but persistent stutterers have additional genetic factors that hamper recovery.
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