No association of tobacco use and disease activity in multiple sclerosis
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BEVITAL AS. About the biomarkers, cotinine [online]. Available at: http://www.bevital.no/. Accessed April 20, 2016.
Folkehelseinstituttet. Rusmidler i Norge 2014 [online]. Available at: https://www.fhi.no/globalassets/dokumenterfiler/rapporter/rin2014norsk.pdf. Accessed April 20, 2016.