Mid Sweden University This is a published version of a paper published in Scandinavian Journal of Work, Environment and Health. Citation for the published paper: Knutsson, A., Alfredsson, L., Karlsson, B., Åkerstedt, T., Fransson, E. et al. (2013) "Breast cancer among shift workers: results of the WOLF longitudinal cohort study" Scandinavian Journal of Work, Environment and Health, 39(2): 170-177 URL: http://dx.doi.org/10.5271/sjweh.3323 Access to the published version may require subscription. Permanent link to this version: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-17818 http://miun.diva-portal.org