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Association of Anxiety Symptom Clusters with Sleep Quality and Daytime SleepinessGould, Christine E.; Spira, Adam P.; Liou-Johnson, Victoria; Cassidy-Eagle, Erin; Kawai, Makoto; Mashal, Nehjla; O’Hara, Ruth; Beaudreau, Sherry A. · The Journals of Gerontology: Series B · 2017