Oral care and nursing home-acquired pneumonia

Data sources Cochrane Oral Health Trials Register, Cochrane Central Register of Controlled Trials, MEDLINE, Embase, CINAHL, Chinese Biomedical Literature Database, China National Infrastructure, US National Institutes of Health Ongoing Trials Registry, WHO Clinical Trials Registry, Sciencepaper Online, 19 Chinese dental and nursing journals. Reference lists of included studies were also screened