Older adults with back pain and spinal morning stiffness longer than 30 minutes are more at risk of developing long-term physical functioning limitations. Issue 1 (April 2020) - van den Berg, R.; Chiarotto, A.; Enthoven, W.T.; de Schepper, E.; Oei, E.H.; Koes, B.W.; Bierma-Zeinstra, S.M.; Erasmus, M.C.