Juan Carlos DurĂ¡n2026-03-222026-03-22201310.1016/j.jns.2013.07.1428https://doi.org/10.1016/j.jns.2013.07.1428https://andeanlibrary.org/handle/123456789/64299enMultiple sclerosisMedicineImmunologyIncreased frequency of multiple sclerosis, the influence of environmental and immunological factorsarticle