1. Center for Research on Health Care, Division of General Internal Medicine, University of Pittsburgh , Pittsburgh, PA 15213 , United States
2. Data Science Institute, University of Chicago , Chicago, IL 60637 , United States
3. Institute of Medicine, University of Gothenburg , Gothenburg 413 46 , Sweden
4. Department of Behavioral and Community Health Sciences, University of Pittsburgh School of Public Health , Pittsburgh, PA 15261 , United States
5. Department of Geography and Geographic Information Science, University of Illinois , Urbana, IL 61801 , United States