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Table of contents
ABSTRACT
INTRODUCTION
Head and neck cancer
Oral cavity cancer
Laryngeal cancer
Hypopharyngeal cancer
The normal floras in the upper airways and the risk of postoperative infections
Antibiotic prophylaxis
Aim of the study
MATERIAL AND METHODS
Patient population and period of time
What have been studied?
Definitions
Statistics
Ethics consideration
RESULTS
DISCUSSION
CONCLUSION
ACKNOWLEDGEMENT
REFERENCES
