International guidelines
United Kingdom
Published by:National Institute for Health and Care Excellence
Last published:2018
Europe
Published by:National Working Group of Medical Societies
Last published:2016
Published by:National Working Group of Medical Societies
Last published:2016
North America
Published by:American Academy of Otolaryngology-Head and Neck Surgery
Last published:2019
Published by:Infectious Diseases Society of America; American Society for Microbiology
Last published:2018
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