Spectrum Effect and Spectrum Bias in the Screening Test Performance for Amnestic Mild Cognitive Impairment: What are the Clinical Implications? Manuscript Number: 15-0195R2 Author(s): Eric Berger, Mickael Binetruy, Gilles Chopard, Jean Galmiche, Eloi Magnin, Frederic Mauny, Agatha Meyer, Marc Puyraveau, Pierre Vandel