[1] Duke Univ, Dept Neurol, Sch Med, Durham, NC 27710 USA
[2] Duke Univ, Dept Anesthesiol, Sch Med, Durham, NC 27710 USA
[3] Duke Univ, Dept Neurobiol, Sch Med, Durham, NC 27710 USA
[4] Duke Neurol Clin Headache Head Pain & Trigeminal, Durham, NC 27705 USA
[5] Duke Univ, Dept Anesthesiol, Clin Innovat Pain Therapy, Raleigh, NC 27512 USA
[6] Regeneron Pharmaceut, Global Sci Dev Council, Chair Neurol, Tarrytown, NY 10591 USA