“…In Rio de Janeiro, São Paulo, Paraná, Santa Catarina, and Rio Grande do Sul, there are several centers dealing with headache disorders and an excellent scientific production has been made by a number of headache specialists, mentioning Abouch Krymchantowski, [217][218][219][220][221][222][223][224][225][226]234,287,[350][351][352][353][354][355] Carla da Cunha Jevoux, 46,204,213,214,223,224,264,265,293,[296][297][298]300,302,303,356 Maurice Vincent, [93][94][95][96][97][98]101,102,104,189,[274][275][276][277]…”