Glintborg, B., Lindström, U., Aaltonen, K., Kristianslund, E., Gudbjornsson, B., Chatzidionysiou, K., Askling, J., Nordström, D., Hetland, M., Di Giuseppe, D., Dreyer, L., Kristensen, L., Jørgensen, T., Eklund, K., Grondal, G., Ernestam, S., Joensuu, J., Törmänen, M., Skydsgaard, H., Hagfors, J., Kvien, T., Lie, E., Fagerli, K., Geirsson, A., Jonsson, H., Provan, S., Krogh, N., & Jacobsson, L. (2018). biological treatment in ankylosing spondylitis in the Nordic countries during 2010–2016: a collaboration between five biological registries. Scandinavian journal of rheumatology, 47, 465–474. http://access.bl.uk/ark:/81055/vdc_100073679332.0x00004e