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Differences of anatomical landmarks among protocols after semantic harmonization. Plane of tracing Axis of hippocampus [1, 2, 4, 6, 10] AC-PC line [3, 5, 7, 8, 9] Most posterior slice Where inferior and superior colliculi are jointly visualized [1] Where crus of fornix is visible in full profile [2, 5, 6] Where the crura of the fornices are seen in full profile on both sides [4, 10] Upper border of alveus/fimbria [2, 4, 6, 7, 8*, 9] Horizontal line from the superior border of the quadrigeminal cistern to the lateral ventricle (tail) [9] Where gray matter is visible inferomedially to the trigone of the lateral ventricle [3, 7•, 8•, 9] Superior border Lower border of alveus/fimbria [1, 3, 5, 10] Separation subiculum/enthorinal cortex vertical line from the CA to the WM of the parahippocampal gyrus [2] 45° line connecting the most inferior part of the subiculum medially to the cistern (head and body) or vertical line from the medial end of the lateral ventricle down to the parahippocampal gyrus (tail) [9¥] Oblique line with same inclination of parahippocampal WM, connecting the inferior part of the subiculum to the quadrigeminal cistern [5, 6, 7¥] Orizontal line from the highest medial point of the parahippocampal WM to the cistern [1, 3, 4¥] Line outlining the contour of white matter of parahippocampal gyrus [8, 10] AC= anterior commissure; PC= posterior commissure; CA=cornu Ammonis; WM=white matter. [1] Bartzokis et al., 1998, [2] Convit et al., 1997, [3] Haller et al., 1997, [4] Jack et al., 1994, [5] Killiany et al., 1993, [6] Lehericy et al., 1994, [7] Malykhin et al., 2007, [8] Pantel et al., 2000, [9] Pruessner et al., 2000, [10] Soininen et al., 1994 * Inclusion of alveus/fimbria depending on MRI resolution; ¥ arbitrary line is used only if morphology does not suggest a clear medial border; • original landmark updated during the teleconference.