Carnethon MR, De Chavez PJ, Zee PC, Kim KY, Liu K, Goldberger JJ, Ng J, Knutson KL. Disparities in sleep characteristics by race/ethnicity in a population-based sample: Chicago Area Sleep Study. Sleep Med. 2016 Feb;18:50-5. doi: 10.1016/j.sleep.2015.07.005. Epub 2015 Jul 26. PubMed PMID: 26459680; PubMed Central PMCID: PMC4728038.