Figure 1.

Estimated analytical model. We assumed that every variable on a “lower” level could be explained by variables higher in the hierarchy (i.e., variables at Level 4 could be explained by all variables at Levels 1 – 3). BMI = body mass index, AChEI = acetylcholine-esterase inhibitor.

Elsais et al. BMC Neurology 2013 13:132   doi:10.1186/1471-2377-13-132
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