P1‐199: Importance of Different Factors for Analysis of β‐Amyloid Isoforms in CSF and Proposal for an Improved Standard Operating Procedure. (1st July 2016) - Vanderstichele, Hugo Marcel; Janelidze, Shorena; Demeyer, Leentje; Coart, Els; Stoops, Erik; Herbst, Victor; Mauroo, Kimberley; Brix, Britta; Hansson, Oskar