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. 2015 Dec 16;5(12):e009841. doi: 10.1136/bmjopen-2015-009841

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

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 and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

PMC Copyright notice

Location of health facilities included in this study (clustering and overlaps prevent two of the pins from being visible near Port Moresby and near Kundiawa). Data for figure 3 is available under the Open Database License. The cartography is licensed as CC BY-SA. www.openstreetmap.org/copyright.