22
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Canadian Agency for Drugs and Technologies in Health

24
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National Center for Biotechnology Information

25
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American Academy of Microbiology

26
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National Academies Press

27
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Agency for Healthcare Research and Quality

29
by Davis, Sarah
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National Institute for Health and Care Excellence (NICE)

30
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National Institute for Health and Care Excellence

31
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National Institute for Health and Care Excellence

33
Published 2009
National Center for Biotechnology Information (US)

34
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Canadian Agency for Drugs and Technologies in Health

36
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U.S. National Library of Medicine, National Institutes of Health, Health & Human Services

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Agency for Healthcare Research and Quality

40
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National Institutes of Health]