Arvin AM, Wolinsky JS, Kappos L, Morris MI, Reder AT, Tornatore C, Gershon A, Gershon M, Levin MJ, Bezuidenhoudt M, Putzki N. Varicella-zoster virus infections in patients treated with fingolimod: risk assessment and consensus recommendations for management. JAMA Neurol. 2015 Jan; 72(1):31-9.