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Commentary on: Meitern R, Gortfelder M, Puur A, et al. Mothers of twins had higher old-age survival than mothers of singletons in Estonian 19th-century birth cohorts. Hum Reprod. 2024 Sep 1;39(9):2124-2133. doi: 10.1093/humrep/deae166. PMID: 39067454.