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http://www.who.int/csr/resources/publications/biosafety/Biosafety7.pdf?ua=1
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2. U.S. Department of Labor (2012) Bloodborne pathogens. In: Occupational safety and health standards.
OSHA.gov
.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10051
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3. Centers for Disease Control and Prevention (2009) Biosafety in microbiological and biomedical laboratories, 5th edn. HHS publication no. (CDC) 21-1112.
https://www.cdc.gov/biosafety/publications/bmbl5/bmbl.pdf
. Accessed 2 Jan 2016