Central Olfactory Dysfunction in Alzheimer’s Disease and Mild Cognitive Impairment: A Functional MRI Study Manuscript Number: 17-0310R2 Author(s): Paul J. Eslinger, David J. Gill, Prasanna Karunanayaka, Brittany Martinez, Xiaoyu Sun, Megha M. Vasavada, Jianli Wang, Qing X. Yang