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Table 1 Sample syntax for database search strategy

From: Prognostic value of microRNAs in head and neck cancers: a systematic review and meta-analysis protocol

1.

“miRNA” [Topic] AND “Head and Neck Cancer” [Topic]

2.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Prognosis” [Topic]

3.

“Head and Neck Cancer” [Topic] AND “Overall Survival” [Topic] OR “Disease Free Survival” [Topic] OR “Disease-Specific Survival” [Topic]

4.

“Head and Neck Cancer” [Topic] AND “miRNA expression” [Topic]

5.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Upregulation” [Topic]

6.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Downregulation” [Topic]

7.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Deregulation” [Topic]

8.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Biomarkers” [Topic]

9.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Surgery” [Topic]

10.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Radiotherapy” [Topic]

11.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Chemotherapy” [Topic]

12.

“Head and Neck Cancer” [Topic] AND “miRNA” [Topic] AND “Clinical study” [Topic]

13.

“Oral cancer” [Topic] AND “miRNA” [Topic]

14.

“Head and Neck Squamous Cell Carcinoma” [Topic] AND “miRNA” [Topic]