Berthelsen, M., Pallesen, S., Mageroy, N., Tyssen, R., Bjorvatn, B., Moen, B., & Knardahl, S. (2015). Effects of psychological and social factors in shiftwork on symptoms of anxiety and depression in nurses: A 1-year follow-up. Journal of Occupational and Environmental Medicine, 57(10), 1127-1137. doi:10.1097/JOM.0000000000000532