| Joseph A Ladapo | Division of General Internal Medicine and Health Services Research, David Geffen School of Medicine at university of california los angeles |
| Steven Shoptaw | University of California los angeles |
| Steven Shoptaw | University of California los angeles |
| John N Mafi | Division of General Internal Medicine and Health Services Research, David Geffen School of Medicine at university of california los angeles |
| John N Mafi | RAND Corporation |