Do you have a link to that paper? My daughter's psychiatrist is interested in PANDAS in a let's-see-how-this-all-turns-out kind of way and I think that study would be something she'd like to see. Not that anybody can get a ybocs score on my kid, but she does have other patients.
Here's one you can use
[Murphy2004] Murphy TK, Muhammad S, Soto O, et al. "Detecting pediatric autoimmune neuropsychiatric disorders associated with streptococcus in children with obsessive-compulsive disorder and tics", Biological Psychiatry, Volume 55, Issue 1, Pages 61-68, January 2004 http://www.journals.elsevierhealth.com/per...0704-2/abstract
thanks!