1. Department of Internal Medicine; University of Cincinnati College of Medicine, Cincinnati, OH, USA (V.T. Martin)
2. Department of Neurology; Albert Einstein College of Medicine and Montefiore Headache Center; Bronx NY USA (J. Pavlovic, D.C. Buse, and R.B. Lipton)
3. Vedanta Research; Chapel Hill NC USA (K.M. Fanning and M.L. Reed)
4. Department of Epidemiology and Population Health; Albert Einstein College of Medicine; Bronx NY USA (R.B. Lipton)