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Flowchart of patient selection from linked clinical registries. Legends: DFMD: Danish Fetal Medicine Database; DCRS: Danish Civil Registration System; DMBR: Danish Medical Birth Registry; DNPR: Danish National Patient Registry; NPR: National Prescription Registry; RA: rheumatoid arthritis; JIA: juvenile idiopathic arthritis. * Incomplete records: pregnancy and birth records without gestational ages, lack of second-trimester fetal ultrasound information, lack of birthweights.
