Anti-CD20 and COVID-19 in multiple sclerosis and related disorders: A case series of 60 patients from Madrid, Spain - Montero-Escribano, Paloma; Matías-Guiu, Jorge; Gómez-Iglesias, Patricia; Porta-Etessam, Jesús; Pytel, Vanesa; Matias-Guiu, Jordi A. (Multiple sclerosis and related disorders, 2020)