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The 8 references without a DOI — listed, not checked
no DOI — not checkedIHME. GBD Compare. Viz Hub. 2017. http://vizhub.healthdata.org/gbd-compare/
no DOI — not checkedPerformance of four class 95 electret filters against diesel particulate matter
no DOI — not checkedShanghai Municipal Bureau of Quality and Technical Supervision. Masks product quality and safety risk monitoring results. Masks Prod. Qual. Saf. Risk Monit. Results 2015. http://www.shzj.gov.cn/art/2014/3/17/art_2383_1026536.html#rd
no DOI — not checkedChinese Consumer Association. 37 masks product protection performance comparison test results. 37 Masks Prod. Prot. Perform. Comp. Test Results. 2016. http://www.cca.org.cn/jmxf/detail/9699.html
no DOI — not checkedU.S. Environmental Protection Agency. Exposure Factors Handbook: 2011 Edition, 2011.
no DOI — not checkedBSI. BS EN 140:1999 Respiratory protective devices. Half masks and quarter masks. Requirements, testing, marking, 1999.
no DOI — not checkedMontgomery DC , Jennings CL , Kulahchi M . Introduction to time series analysis and forecasting. Wiley, 2015.
no DOI — not checkedZhang J , Mu Q . Air pollution and defensive expenditures: evidence from particulate-filtering facemasks. Rochester, NY: Social Science Research Network, 2016. (accessed 28 Feb 2017).
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