1. Indiana University, Institute for the Study of Developmental Disabilities, 2853 East 10th Street, Bloomington, IN 47408-2601, USA
2. O'Neill and Associates, 101 Stewart Street, Suite 1100, Seattle, WA 98101, USA
3. King County Department of Community and Human Services, Developmental Disabilities Division, 700 Fifth Avenue, 38th Floor, Seattle, WA 98104-5038, USA