1. Neurology Center; Encinitas CA USA
2. Jefferson Headache Center; Department of Neurology, Thomas Jefferson University; Philadelphia PA USA
3. Department of Neurology; Mayo Clinic; Phoenix AZ USA
4. Department of Neurology; Stanford University; Stanford CA USA
5. Allergan plc; Irvine CA USA
6. Department of Neurology; University of California at Irvine; Irvine CA USA
7. Department of Head and Neck Surgery; University of California at Los Angeles; Los Angeles CA USA