1. Division of Pharmaceutical Outcomes and Policy, University of North Carolina Eshelman School of Pharmacy, Asheville, North Carolina, USA.
2. Department of Pediatrics and University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA.
3. Department of Psychiatry, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA.
4. Department of Special Education, Ball State University, Muncie, Indiana, USA.
5. Cecil G. Sheps Center for Health Services Research, Chapel Hill, North Carolina, USA.