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2. ANTT Clinical Guideline Collections for Hospitals 2013 http://antt.org/ANTT_Site/resources.html
3. Consensus based clinical guideline for oral hygiene in the critically ill;Berry;Intensive and Critical Care Nursing,2011
4. Cost analysis of intubation-related tracheal injury using a national database;Bhatti;Otolaryngology-Head and Neck Surgery,2010