Langballe, E. M., K. Tambs, I. Saltvedt, K. Midthjell, and J. Holmen. “The Association Between Vascular Factors and Subjective Memory Impairment in Older People: The HUNT Study, Norway”. Norsk Epidemiologi, vol. 22, no. 2, Nov. 2012, doi:10.5324/nje.v22i2.1568.