Pressure pain threshold in the craniocervical muscles of women with episodic and chronic migraine: a controlled study - Grossi, Débora Bevilaqua; Chaves, Thaís Cristina; Gonçalves, Maria Claudia; Moreira, Viviane Coimbra; Canonica, Alexandra Carolina; Florencio, Lidiane Lima; Bordini, Carlos Alberto; Speciali, Jose Geraldo; Bigal, Marcelo Eduardo (Arquivos de Neuro-Psiquiatria, 2011)