∗Positive University Curitiba

†Research Unit, Hospital Pequeno Principe

‡Headache and Pain Unit, Hospital de Clinicas, Federal University of Parana

§Clinical Research Unit, Neurological Institute of Curitiba

∥Headache and Pain Unit, Hospital de Clinicas, Federal University of Parana, Curitiba, Brazil.

Address correspondence and reprint requests to Pedro André Kowacs, MS, Neurological Institute of Curitiba, Rua Jeremias Maciel Perretto, 300, 81210-310, Curitiba, PR, Brazil; E-mail: [email protected]

Conflicts of Interest and Source of Funding: The authors have no conflicts of interest to declare.