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Table 2 Keywords and query used to search PUBMED and SCOPUS

From: Assessing the hospital volume-outcome relationship in surgery: a scoping review

Database Keywords and query
PUBMED Keywords: Volume, outcome, hospital, surgery, surgical, mortality, morbidity, cost
Query: (“Volume-outcome” OR “Volume-mortality” OR (“hospital volume” AND (“outcome” OR “mortality” OR “morbidity” OR “cost”))) AND (“surgery” OR “surgical”) AND “hospital” NOT “surgeon”[TITLE]
Scopus Keywords: Volume, outcome, hospital, surgery, surgical, mortality, morbidity, cost
Query: TITLE-ABS-KEY ((“Volume-outcome” OR “Volume-mortality” OR (“hospital volume” AND (“outcome” OR “mortality” OR “morbidity” OR “cost”))) AND “surgery” AND “hospital”) AND NOT TITLE(“surgeon”) AND (LIMIT-TO (PUBSTAGE, “final”)) AND (LIMIT-TO(DOCTYPE, “ar”)) AND (LIMIT-TO (LANGUAGE, “English”))