Technology supported High Intensity Training in chronic non-specific low back pain (the Techno-HIT trial): study protocol of a randomised controlled trial oleh Mira Meeus, Wim Marneffe, Julie Sylvie van Eetvelde, Annick A A Timmermans, Karin Coninx, Kristof Kempeneers, Timo Meus, Iris Meuwissen, Nathalie Anne Roussel, Gaetane Stassijns, Jonas Verbrugghe