TY  - RPRT
TI  - Behavioral-graded activity compared with usual care after first-time disk surgery: considerations of the design of a randomized clinical trial.
AU  - R W Ostelo
AU  - A J Köke
AU  - A J Beurskens
AU  - H C de Vet
AU  - M R Kerckhoffs
AU  - J W Vlaeyen
AU  - P M Wolters
AU  - M W Berfelo
AU  - P A van den Brandt
PY  - 2000
UR  - https://pubmed.ncbi.nlm.nih.gov/10863250/
ID  - 10863250
ER  -