On confounders: known and unknown. The spine journal : official journal of the North American Spine Society [Spine J] Journal article

COMMENTARY ON: Resnick DK, Rajpal S, Steinmetz M. Common pitfalls in interpretation of medical evidence: a case demonstration of misleading interpretation in the analysis of cervical spine fusions. Spine J 2009;9:905-9 (in this issue).

The spine journal : official journal of the North American Spine Society [Spine J]