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Senaratna, Chamara ORCID: https://orcid.org/0000-0002-5879-6174, Priyadarshanie, Nirmala, Fernando, Sharaine ORCID: https://orcid.org/0000-0002-6586-1034, Goonewardena, Sampatha ORCID: https://orcid.org/0000-0002-3368-7959, Piyumanthi, Pramodya ORCID: https://orcid.org/0000-0002-1266-9014, Perret, Jennifer, Lodge, Caroline, Hamilton, Garun ORCID: https://orcid.org/0000-0002-1744-2839 and Dharmage, Shyamali C ORCID: https://orcid.org/0000-0001-6063-1937 (2023) Longitudinal Sleep Study in Pregnancy: Cohort Profile and Prevalence and Risk Factors for Sleep Symptoms in the First Trimester. International Journal of Environmental Research and Public Health, 20 (3). ISSN 1661-7827 (print) 1660-4601 (online)