Relationship of amyloid beta and neurofibrillary tau deposition in Neurodegeneration in Aging Down Syndrome (NiAD) study at baseline oleh DL Tudorascu, CM Laymon, M Zammit, DS Minhas, SJ Anderson, PA Ellison, S Zaman, BM Ances, M Sabbagh, SC Johnson, CA Mathis, WE Klunk, BL Handen, BT Christian, AD Cohen