Methodological considerations--an attempt to use treatment outcomes to validate a classification system for back problems: a critical analysis of a quasi-experiment.
Holland
John P
JP
Holland Associates, 9226 Milburn Loop SE, Olympia, WA 98513, USA.
Bigos
Stanley J
SJ
D006801:Humans; D017116:Low Back Pain / Q000145:classification* / Q000534:rehabilitation*; D016896:Treatment Outcome; D054928:Validation Studies as Topic