[1] Dept Vet Affairs, Vet Hlth Adm, Headache Ctr Excellence HCoE, Orange, CT USA
[2] Yale Sch Med, Dept Neurol, New Haven, CT USA
[3] Yale Univ, Yale Ctr Analyt Sci, New Haven, CT USA
[4] Yale Sch Publ Hlth, New Haven, CT USA
[5] Albert Einstein Coll Med, Bronx, NY USA
[6] Montefiore Med Ctr, Bronx, NY USA
[7] Columbia VA Hlth Care Syst, Columbia, SC USA
[8] Yale Sch Med, Dept Neurol, New Haven, CT USA
[9] VA Connecticut Healthcare Syst, Neurol Serv, West Haven, CT USA
[10] VA Connecticut Healthcare Syst, Pain Res Informat & Multimorbid & Educ PRIME Ctr, West Haven, CT USA
[11] Yale Sch Med, Ctr Neuroepidemiol & Clin Neurol Res, New Haven, CT USA
[12] VA Connecticut Healthcare Syst, Clin Epidemiol Res Ctr CERC, West Haven, CT USA
[13] Yeshiva Univ, Bronx, NY USA