  This Letter to the Editor points out several inconsistencies found in the
paper written by Makoto Miyazaki and Ryugo Hayano published as J. Radiol. Prot.
37(2017) 623-634. This Letter to the Editor had been in the stage of "is ready
to accept" from November 17, 2018 to March 23, 2020 when it has been accepted
for publication. Onto this Letter to the Editor, an additional Letter to the
Editor on the same paper has been added. The added Letter to the Editor has
been provisionally accepted on April 7, 2020.
