Authors: Cynthia R Johnson; Eric M Butter; Benjamin L Handen; Denis G Sukhodolsky; James Mulick; Luc Lecavalier; Michael G Aman; L Eugene Arnold; Lawrence Scahill; Naomi Swiezy; Kelley Sacco; Kimberly A Stigler; Christopher J McDougle Journal: J Intellect Dev Disabil Date: 2009-09