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BMC Public Health > 2018 > 18 > 1 > 1-21
Archives of Gerontology and Geriatrics > 2014 > 59 > 1 > 98-106
Demography > 2013 > 50 > 2 > 661-671
BMC Public Health > 2018 > 18 > 1 > 1-21
Archives of Gerontology and Geriatrics > 2014 > 59 > 1 > 98-106
Demography > 2013 > 50 > 2 > 661-671