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This abstract has been published as a full paper: Fink G, McCoy DC, Jäggi L, Hinckley K, Castellanos A, Huaylinos Bustamante ML, et al. Digital support systems to improve child development in Peru: A cluster-randomized controlled open-label trial. Sci Adv. 2026;12(10):eaeb9403. doi: 10.1126/sciadv.aeb9403. PMID: 41779842. Available at: https://www.science.org/doi/10.1126/sciadv.aeb9403