1. VHA Headache Centers of Excellence Research and Evaluation Center, VA Connecticut Healthcare System, Orange, CT, USA
2. University of Rhode Island, Kingston, RI, USA
3. Warren Alpert Medical School of Brown University, Providence, RI, USA
4. Harvard T.H. Chan School of Public Health, Boston, MA, USA
5. Veterans Health Administration Health Services Research and Development (HSR&D) Center for Health Information and Communication and Quality Enhancement Research Initiative Expanding expertise Through E-health Network Development (EXTEND) QUERI Centers, Roudebush VA Medical Center, Indianapolis, IN, USA
6. Yale School of Medicine, New Haven, CT, USA
7. Indiana University School of Medicine, Indianapolis, IN, USA
8. Regenstrief Institute, Inc., Indianapolis, IN, USA