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APA Citation
Gudnadóttir, A. Ý., Ólafsdóttir, I. S., Middelveld, R., Ekerljung, L., Forsberg, B., Franklin, K., Lindberg, E., & Janson, C. (2017). an investigation on the use of snus and its association with respiratory and sleep-related symptoms: a cross-sectional population study. BMJ open, 7(5), . http://access.bl.uk/ark:/81055/vdc_100135145616.0x00000c