1. Comprehensive Health Innovation, Research and Policy Division, RTI International, Waltham, MA, USA.
2. Comprehensive Health Innovation, Research and Policy Division, RTI International, Chicago, IL, USA.
3. RTI International, Washington, DC, USA.
4. Division of Post-Acute Care, Center for Clinical Standards and Quality, Centers for Medicare & Medicaid Services, Baltimore, MD, USA.
5. Comprehensive Health Innovation, Research and Policy Division, RTI International, Research Triangle Park, NC, USA.