Z3A: Weeks of gestation
Z3A.2: Weeks of gestation of pregnancy, weeks 20-29
Z3A.20: 20 weeks gestation of pregnancy
Z3A.21: 21 weeks gestation of pregnancy
Z3A.22: 22 weeks gestation of pregnancy
Z3A.23: 23 weeks gestation of pregnancy
Z3A.24: 24 weeks gestation of pregnancy
Z3A.25: 25 weeks gestation of pregnancy
Z3A.26: 26 weeks gestation of pregnancy
Z3A.27: 27 weeks gestation of pregnancy
Z3A.28: 28 weeks gestation of pregnancy
Z3A.29: 29 weeks gestation of pregnancy
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