Comment on

• Higher latitude is significantly associated with an earlier age of disease onset in multiple sclerosis.

  Tao C, Simpson S Jr, van der Mei I, Blizzard L, Havrdova E, Horakova D, Shaygannejad V, Lugaresi A, Izquierdo G, Trojano M, Duquette P, Girard M, Grand'Maison F, Grammond P, Alroughani R, Terzi M, Oreja-Guevara C, Sajedi SA, Iuliano G, Sola P, Lechner-Scott J, Pesch VV, Pucci E, Bergamaschi R, Barnett M, Ramo C, Singhal B, LA Spitaleri D, Slee M, Verheul F, Fernández Bolaños R, Amato MP, Cristiano E, Granella F, Hodgkinson S, Fiol M, Gray O, McCombe P, Saladino ML, Sánchez Menoyo JL, Shuey N, Vucic S, Shaw C, Deri N, Arruda WO, Butzkueven H, Spelman T, Taylor BV; MSBase Study Group. Tao C, et al. J Neurol Neurosurg Psychiatry. 2016 Dec;87(12):1343-1349. doi: 10.1136/jnnp-2016-314013. Epub 2016 Nov 3. J Neurol Neurosurg Psychiatry. 2016. PMID: 27810919
• Vitamin D supplementation reduces relapse rate in relapsing-remitting multiple sclerosis patients treated with natalizumab.

  Laursen JH, Søndergaard HB, Sørensen PS, Sellebjerg F, Oturai AB. Laursen JH, et al. Mult Scler Relat Disord. 2016 Nov;10:169-173. doi: 10.1016/j.msard.2016.10.005. Epub 2016 Oct 26. Mult Scler Relat Disord. 2016. PMID: 27919484