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Johnsen, M., Vie, G., Winsvold, B., Bjørngaard, J., Åsvold, B., Gabrielsen, M., Pedersen, L., Hellevik, A., Langhammer, A., Furnes, O., Flugsrud, G., Skorpen, F., Romundstad, P., Storheim, K., Nordsletten, L., & Zwart, J. (n.d.). the causal role of smoking on the risk of hip or knee replacement due to primary osteoarthritis. a mendelian randomization analysis of the nord-trØndelag health study. Osteoarthritis and cartilage, 25, S181–S182. http://access.bl.uk/ark:/81055/vdc_100045518862.0x000001