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U.S. National Institutes of Health, Bethesda, USA
Journal, American Society for Microbiology, Washington, USA
Journal, BioMed Central, London, UK
Textbook, WHO 1998
Doctor's Guide Publishing Limited
Cancer Australia, Dickson, Australia
Journal, John Wiley & Sons, Inc., Hoboken, USA
Medline Plus, US National Library of Medicine, Bethesda, USA
Strana 5 z 6