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Journal of the American Medical Directors Association > 2017 > 18 > 10 > 898.e1-898.e8
GeroScience > 2017 > 39 > 5-6 > 551-556
Surgical Oncology > 2010 > 19 > 3 > 117-123
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz > 2010 > 53 > 5 > 441-450