| Year | Brother A | Brother B |
---|---|---|---|
Baseline | 1995 | NPA, MRI, CSF | NPA, CSF |
+  1 year | 1996 | FDG-PET | FDG-PET |
+  2 years | 1997 | NPA, MRI | NPA |
+  3 years | 1998 | FDG-PET | FDG-PET |
+  6 years | 2001 | NPA, MRI | NPA |
+  11 years | 2006 | NPA, MRI, CSF, FDG-PET | NPA, CSF, FDG-PET |
+  12 years | 2007 | Interview |  |
+  13 years | 2008 | NPA, FDG-PET, PiB-PET |  |
+  14 years | 2009 | NPA, MRI, FDG-PET, PiB-PET | NPA, MRI, FDG-PET, PiB-PET |
+  16 years | 2011 |  | NPA |
+  17 years | 2012 |  | PiB-PET |
+  18 years | 2013 |  | NPA |
+  20 years | 2015 | Interview, MMSE | Interview, MMSE |
+  22 years | 2017 |  | NPA |