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Biddulph, Jane P; Iliffe, Steve; Kharicha, Kalpa; Harari, Danielle; Swift, Cameron; Gillmann, Gerhard; Stuck, Andreas (2014). Risk factors for depressed mood amongst a community dwelling older age population in England: cross-sectional survey data from the PRO-AGE study. BMC Geriatrics, 14(5), p. 5. BioMed Central 10.1186/1471-2318-14-5
