Brazilian headache registry: methods and preliminary data of the pilot study by Vanise Grassi, Mauro Eduardo Jurno, Alan Christmann Fröhlich, Carlos Roberto de Mello Rieder, Elder Machado Sarmento, Júlia Kássia Pereira, Leonardo Lima Silva, Liselotte Menke Barea, Luiz Ernesto Besen Poli, Luiz Paulo Queiroz, Marcelo Cedrinho Ciciarelli, Mario Fernando Prieto Peres, Pedro Augusto Sampaio Rocha Filho, Rebeca Veras de Andrade Vieira, Renata Gomes Londero, Fernando Kowacs

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