Zhao Q, Xiong Y, Ding D, Guo Q, Hong Z. Synergistic effect between apolipoprotein E ε4 and diabetes mellitus for dementia: result from a population-based study in urban China. J Alzheimers Dis. 2012;32(4):1019–27. doi: 10.3233/jad-2012-120442. PMID: 22890095.