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Flowchart of patient recruitment and data analysis procedure. A total of 3,331 COVID-19 patients from Tongji Hospital were screened and a total of 319 reproductive-aged female patients with complete medical recording were enrolled. Patients were grouped as pregnant (n = 20) and non-pregnant (n = 299), and compared by clinical characteristics, laboratory findings, and cytokines. Ten healthy pregnant women were included as control.
