Reliability and validity of the Yale Global Tic Severity Scale.
Storch, Eric A.; Murphy, Tanya K.; Geffken, Gary R.; Sajid, Muhammad; Allen, Pam; Roberti, Jonathan W.; Goodman, Wayne K.; Psychological Assessment, 2005, vol. 17, issue 4, p 486, ISSN 10403590. ISBN 10403590.

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