Negative life events and migraine: a cross-sectional analysis of the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) baseline data - Santos, Itamar S.; Brunoni, André R.; Goulart, Alessandra Carvalho; Griep, Rosane H.; Lotufo, Paulo A.; Benseñor, Isabela M (BMC Public Health, 2014)