DOI:
10.1055/s-00000075
Seminars in Respiratory and Critical Care Medicine
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References
World Population Prospects.
2015 Revision. United Nations Department of Economic and Social Affairs. Population Division.
Available at
http://esa.un.org/unpd/wpp/publications/files/key_findings_wpp_2015.pdf. Accessed May 13, 2016
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