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. 2020 Jun 3;6(2):e001202. doi: 10.1136/rmdopen-2020-001202

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Distance from residential place to the nearest waterfront. Histograms showing the number of patients hierarchised by the distance from the residential place at disease onset to the nearest waterfront. The distance was categorised by multiplication of 1.75 km. Zone 0 covers the distance from 0 to 1.75 km, while Zone 1 covers the distance from 1.75 to 3.50 km. P values were calculated by exact Wilcoxon rank-sum test. (A) Distance to any waterfront. (B) Distance to seawater. (C) Distance to freshwater (river, lake or pond).