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(A) BPD (B) HC (C) AC (D) FL (E) EFW. The period 1, 2, 3 mean 24+0~28+6, 29+0~32+6, and 33+0~35+6 weeks of gestation, respectively. BPD, biparietal diameter; HC, head circumference; AC, abdominal circumference; FL, femur length; EBW, estimated fetal weight.
