Association Between Time Spent Outdoors and Risk of Multiple Sclerosis.

Sebastian P, Cherbuin N, Barcellos LF, Roalstad S, Casper C, Hart J, Aaen GS, Krupp L, Benson L, Gorman M, Candee M, Chitnis T, Goyal M, Greenberg B, Mar S, Rodriguez M, Rubin J, Schreiner T, Waldman A, Weinstock-Guttman B, Graves J, Waubant E, Lucas R, US Network of Pediatric Multiple Sclerosis Centers