1. Headache & Face Pain Program; Tufts Medical Center, and Craniofacial Pain Center; Tufts University School of Dental Medicine; Boston Massachusetts U.S.A
2. Department of Anesthesiology; Duke University Medical Center; Durham North Carolina U.S.A
3. Carolinas Pain Institute; Winston-Salem North Carolina U.S.A
4. Sucampo Pharma Americas, LLC; Bethesda Maryland U.S.A