Figure 1
The flowchart begins with the identification phase. Records are identified from databases, totaling 1 record. Records removed before screening include 0 duplicates and 12 for other reasons. The screening phase starts with 697 records screened. 12 records are excluded. 685 reports are sought for retrieval, with 12 reports not retrieved. 685 reports are assessed for eligibility, and 12 reports are excluded for being in a language other than English. The included phase shows 685 studies included in the review.PRISMA 2020 flow diagram. Source: BMJ 2021;372:n71