Generalised estimating equations and low back pain.
Harkness
E F
EF
Nahit
E S
ES
Macfarlane
G J
GJ
Silman
A J
AJ
McBeth
J
J
Dunn
G
G
D006801:Humans; D017116:Low Back Pain / Q000209:etiology*; D009784:Occupational Diseases / Q000209:etiology*; D015203:Reproducibility of Results; D013997:Time Factors