2008 | Differences across health care systems in outcome and cost-utility of surgical and conservative treatment of chronic low back pain : a study protocol | Melloh, Markus; Röder, Christoph; Elfering, Achim; Theis, Jean-Claude; Müller, Urs; Staub, Lukas P.; Aghayev, Emin; Zweig, Thomas; Barz, Thomas; Kohlmann, Thomas; Wieser, Simon; Jüni, Peter; Zwahlen, Marcel |