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Hajek, A., Brettschneider, C., Luehmann, D., Eisele, M., Mamone, S., Wiese, B., Weyerer, S., Werle, J., Pentzek, M., Fuchs, A., Stein, J., Luck, T., Bickel, H., Weeg, D., Heser, K., Jessen, F., Maier, W., Scherer, M., Riedel-Heller, S. G. and Koenig, H. -H. (2017). Does visual impairment affect social ties in late life? Findings of a multicenter prospective cohort study in Germany. J. Nutr. Health Aging, 21 (6). S. 692 - 699. PARIS: SPRINGER FRANCE. ISSN 1760-4788