Migraine in childhood and adolescence: a critical study of the diagnostic criteria and of the influence of age on clinical findings - Gherpelli, J.L.D.; Loomis, Dana; Conceição, Gleice Margarete de Souza; Braga, Alfésio L.F.; Arcas, Rosângela M.; Kishi, Humberto S.; Singer, Júlio da Motta; Bohm, Gyorgy; Saldiva, Paulo Hilário Nascimento (Environmental Health Perspectives, 1998)