Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Stienen, Martin N; Ho, Allen L; Staartjes, Victor E; Maldaner, Nicolai; Veeravagu, Anand; Desai, Atman; Gautschi, Oliver P; Bellut, David; Regli, Luca; Ratliff, John K; Park, Jon (2019). Objective measures of functional impairment for degenerative diseases of the lumbar spine: a systematic review of the literature. The Spine Journal, 19(7):1276-1293.