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Generalized estimating equation analyses of (a) VI, (b) FI, (c) VFI, and (d) placental volume during the first and second trimesters in the SGA (∙∙∙) and control (—) groups. VI: vascularization index; FI: flow index; VFI: vascularization flow index; GA: gestational age; PV: placental volume.
