Reduced serum immunoglobulin G concentrations in multiple sclerosis: prevalence and association with disease-modifying therapy and disease course oleh Greta Zoehner, Andrei Miclea, Anke Salmen, Nicole Kamber, Lara Diem, Christoph Friedli, Maud Bagnoud, Farhad Ahmadi, Myriam Briner, Nazanin Sédille-Mostafaie, Constantinos Kilidireas, Leonidas Stefanis, Andrew Chan, Robert Hoepner, Maria Eleftheria Evangelopoulos