van Seben, R., Covinsky, K.E., Reichardt, L.A., Aarden, J.J., van der Schaaf, M., van der Esch., M., Engelbert, H.H., Twisk, J.W.R., Bosch, J.A., Buurman, B.M. (2019); An acquired state of vulnerability or a vulnerable patient? A 3-month longitudinal follow up on geriatric syndromes and their association with functional decline, readmission and mortality. Journal of Gerontology accepted for publication