Linder, Jürgen, Gunilla Brodda Jansen, Kristina Schüldt Ekholm, and Jan Ekholm. 2014. “Relationship Between Sleep Disturbance, Pain, Depression and Functioning in Long-Term Sick-Listed Patients Experiencing Difficulty in Resuming Work”. Journal of Rehabilitation Medicine 46 (8):798-805. https://doi.org/10.2340/16501977-1833.