Oxidative Stress is Increased in Serum from Mexican Patients with Relapsing-Remitting Multiple Sclerosis - Ortiz, Genaro Gabriel; Macías-Islas, Miguel Ángel; Pacheco-Moisés, Fermín P.; Cruz-Ramos, José A.; Sustersik, Silvia; Barba, Elías Alejandro; Aguayo, Adriana (Disease Markers, 2009)