1. Ribeirão Medical School University Hospital; Ribeirão Preto Brazil
2. Clinica Neurológica Batatais; Batatais Brazil
3. Stanford Headache and Facial Pain Program, Department of Neurology and Neurological Sciences, Stanford University School of Medicine; Stanford CA USA
4. Department of Neurology, Addis Ababa University School of Medicine; Addis Ababa Ethiopia
5. Department of Neurology; The David Geffen School of Medicine at UCLA in Los Angeles; CA USA.