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Koetsier, Eva; van Kuijk, Sander M J; Maino, Paolo; Dukanac, Jasmina; Scascighini, Luca; Cianfoni, Alessandro; Scarone, Pietro; Kuhlen, Dominique E; Hollman, Markus W; Kallewaard, Jan-Willem (2022). Efficacy of the Gelstix nucleus augmentation device for the treatment of chronic discogenic low back pain: protocol for a randomised, sham-controlled, double-blind, multicentre trial. BMJ open, 12(3), e053772. BMJ Publishing Group 10.1136/bmjopen-2021-053772
