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Generalised estimating equations and low back pain.
Harkness EF, Nahit ES, Macfarlane GJ, Silman AJ, McBeth J, Dunn G. Harkness EF, et al. Among authors: nahit es. Occup Environ Med. 2003 May;60(5):378-80; author reply 380-1. doi: 10.1136/oem.60.5.378-a. Occup Environ Med. 2003. PMID: 12709527 Free PMC article. No abstract available.