risque (1) province (1) maladie infectieuse (1) infection (1) revenu (1) épidémiologie (1) éducation (1) taux (1) Education (1) Epidemiology (1) Language (1) Children (1) Prevention (1) English (1) States (1) Birth (1) Women (1) Ci (Chinese poetry) (1) Serum (1) Serology (1) Risk (1) Proportion (1) Pregnant women (1) Pregnancy (1) Parturition (1) Labor (Obstetrics) (1) Infection (1) Income (1) Immunoglobulins (1) Immunoglobulin G (1)