Thank you very much for your interest in our paper (Kawada, 2018). First, the patients in our study were from one single medical center, while Bonanni's study was a nationwide multicenter research project. Therefore, we do not think it is appropriate to compare these two studies directly. Regarding the sample size, each of the three groups were eligible for statistical analysis, and it is of course better to pursue the same issue with bigger sample sizes, especially, for FTD and DLB in future studies.