1. IWK Health Centre & Dalhousie University; Halifax Nova Scotia Canada
2. IWK Health Centre; Centre for Pediatric Pain Research; K8536 (8th Floor, Children's site) 5850/5980 University Avenue, PO Box 9700 Halifax Canada B3K 6R8
3. Department of Pediatrics (GI Division), IWK Health Centre; Department of Psychology, Dalhousie University; 5850/5980 University Avenue P.O. Box 9700 Halifax Noval Scotia Canada B3K 6R8
4. The University of Queensland; School of Population Health; Brisbane Australia