Authors: Ostelo, RWJG Koke, AJA Beurskens, AJHM de Vet, HCW Kerckhoffs, MR Vlaeyen, JWS Wolters, PMJC Berfelo, MW van den Brandt, PA

Citation: Rwjg. Ostelo et al., Behavioral-graded activity compared with usual care after first-time disk surgery: Considerations of the design of a randomized clinical trial, J MANIP PHY, 23(5), 2000, pp. 312-319