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Zeitschrift für Gerontologie und Geriatrie > 2019 > 52 > 4 > 249-257
BMC Health Services Research > 2018 > 18 > 1 > 1-13
BMC Health Services Research > 2017 > 17 > 1 > 1-10
Zeitschrift für Gerontologie und Geriatrie > 2019 > 52 > 4 > 249-257
BMC Health Services Research > 2018 > 18 > 1 > 1-13
BMC Health Services Research > 2017 > 17 > 1 > 1-10