CTLA-4 and CD28 gene polymorphisms in susceptibility, clinical course and progression of multiple sclerosis
Tineke van Veen a,b,*, J. Bart A. Crusius c, Lisa van Winsen a, Bing Xia d, Frederik Barkhof e, A. Salvador Peña c, Chris H. Polman a, Bernard M.J. Uitdehaag a b
