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. 2021 Feb 17;9:529733. doi: 10.3389/fped.2021.529733

Figure 1.

Figure 1

PRISMA systematic review flowchart. Search Expression—PubMed®: (participation OR “response rate” OR “response proportion” OR “follow-up rate” OR “follow-up proportion” OR “follow-up participation” OR “follow-up strategy” OR lost to follow-tip” OR “loss to follow-up” OR “retention rate” OR “retention proportion” OR “non-compliance” OR “non-response” OR “refusal” OR “attrition” OR “dropping out” OR “dropout” OR “drop-out” OR “reimbursement” OR “incentive” OR “motivation”) AND (“cohort” OR “prospective” OR “retrospective” OR “longitudinal” OR observational OR “population-based”) AND (“preterm” OR “premature” OR “prematurity” OR “low birth weight” OR “low birthweight”).