DOI:
10.1055/s-00000065
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References
Adams G, Gulliford MC, Ukoumunne OC. et al.
Patterns of intra-cluster correlation from primary care research to inform study design and analysis.
J Clin Epidemiol 2004;
57: 785-794 doi:10.1016/j.jclinepi.2003.12.013
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