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. 2019 Sep 9;9:12917. doi: 10.1038/s41598-019-49357-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Pancreatic cancer mortality clusters at the county level in Shandong for the years 2011 to 2013 using the spatial scan statistical analysis. (a) Total without adjustment (most likely cluster, secondary cluster 1, 2 and 3); (b) Total adjusted for age (most likely cluster and secondary cluster 1); (c) Urban without adjustment (most likely cluster, secondary cluster 1, 2 and 3); (d) Urban adjusted for age (most likely cluster and secondary cluster 1); (e) Rural without adjustment (only one most likely cluster); (f) Rural adjusted for age (only one most likely cluster).