Botulinum toxin type-A effect as a preemptive treatment in a model of acute trigeminal pain: a pre-clinical double-blind and placebo-controlled study oleh Elcio Juliato Piovesan, Lucas da Silva Leite, Helio Ghizoni Teive, Pedro André Kowacs, Rogério Andrade Mulinari, Victor Radunz, Marco Utiumi, Helder Groenwold Campos, Lineu Cesar Werneck