Increased plasma levels of brain derived neurotrophic factor (BDNF) after multiple sclerosis relapse - Frota, Elizabeth Regina Comini; Rodrigues, David henrique; Donadi, Eduardo Antônio; Brum, Doralina Guimarães; Maciel, Damacio Ramón Kaimen; Teixeira, Antônio Lúcio (Neuroscience Letters, 2009)