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This was an observational cross-sectional study using publicly-available secondary data. Japan consists of 47 prefectures, of which the smallest administrative division is municipalities. We targeted all the municipalities in Japan as at January 11, 2015 (n = 1,896).
Copyright and License information: ©2016 Kawaguchi, Koike
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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