| # 5 | 101 | #4 Timespan=2012‐2018 |
| # 4 | 331 | #3 AND #2 AND #1 |
| # 3 | 4,539,758 | TS= clinical trial* OR TS=research design OR TS=comparative stud* OR TS=evaluation stud* OR TS=controlled trial* OR TS=follow‐up stud* OR TS=prospective stud* OR TS=random* OR TS=placebo* OR TS=(single blind*) OR TS=(double blind*) |
| # 2 | 19,362 | TS=((epidural* OR peridural* OR extradural* OR subarachnoid* OR neuraxial*) AND (an?esth* or analg*)) |
| # 1 | 191,475 | TS=(((coronary or heart or cardio* or cardiac* or valve) NEAR/5 (surg* or graft* or bypass or plasty or replacement)) or cabg) |
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