PLoS ONE, Vol 14, Iss 8, p e0221645 (2019) PLoS ONE Ismailova, K, Poudel, P, Parlesak, A, Frederiksen, P & Heitmann, B L 2019, ' Vitamin D in early life and later risk of multiple sclerosis-A systematic review, meta-analysis ', PLoS ONE, vol. 14, no. 8, e0221645 . https://doi.org/10.1371/journal.pone.0221645