aDepartments of Anesthesiology and Peri-Operative Medicine and Psychiatry, Oregon Health & Science University, Portland, OR 97239, USA bDepartments of Pediatrics and Psychology, Dalhousie University, Halifax, NS, Canada *Corresponding author. Address: Department of Anesthesiology and Peri-Operative Medicine, UHS-2 Oregon Health & Science University, 3181 SW Sam Jackson Park Rd. Portland, OR 97239-3098, USA. Tel.: +1 503 494 0848; fax: +1 503 494 4518. E-mail address:[email protected] Submitted October 21, 2005; accepted October 31, 2005.
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