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Flow diagram of pilot study, baseline recruitment, and follow-up for the Zhejiang Environmental and Birth Health Research Alliance (ZEBRA) maternity cohort study. ZEBRA was established in late 2022 when the design of the Maternity Cohort was completed; the information collection for newly recruited participants since 2023 is still ongoing, so approximate sample sizes are used to represent expectations. CNEMC, China National Environmental Monitoring Centre.
