Before revision:  However, to our knowledge, little has been investigated in terms of the comparability of results between different data sets of healthy human subjects as well as the reliability of results over  different rescan sessions and FreeSurfer versions.
After revision:  However, to our knowledge, little has been investigated in terms of the comparability of results between different data sets of healthy human subjects as well as the reliability of results over the same subjects in different rescan sessions and FreeSurfer versions.