Environmental factors in early childhood are associated with multiple sclerosis: a case-control study.
Conradi S, Malzahn U, Schröter F, Paul F, Quill S, Spruth E, Harms L, Then Bergh F, Ditzenbach A, Georgi T, et al. BMC Neurol. 2011 Oct 6; 11:123. Epub 2011 Oct 6.