机译:Folate Levels by Time Since Last Live Birth Among US Women, 2007-2016
Hlth Resources & Serv Adm, Maternal & Child Hlth Bur, Off Epidemiol & Res, 5600 Fishers Lane;
Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Baltimore, MD USA;
Univ Southern Maine, Muskie Sch Publ Serv, Portland, ME 04103 USA;
folate; postpartum; women; interpregnancy interval; birth spacing;