Prevalence and prognosis of Alzheimer?s disease at the mild cognitive impairment stage - Vos, Stephanie J. B.; Verhey, Frans; Frölich, Lutz; Kornhuber, Johannes; Wiltfang, Jens; Maier, Wolfgang; Peters, Oliver; Rüther, Eckart; Nobili, Flavio; Morbelli, Silvia; Frisoni, Giovanni B.; Drzezga, Alexander; et al. (2015)