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. 2018 Oct 16;6:e5755. doi: 10.7717/peerj.5755

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©2018 Yamaguchi et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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The image was obtained from Google Maps (https://www.google.co.jp/maps). Map of Japan showing Sapporo: Image ©2018 Landsat/Copernicus, Data SIO NOAA, Navy, NGA, GEBCO, Detailed view of Sapporo: Image ©2018 Google, Data SIQ, NOAA, U.S. Navy, NGA, GEBCO, Map data.