5Gjergja R, Stipoljev F, Hafner T, et al. Knowledge and use of folic acid in Croatian pregnant women-a need for health care education initiative [ J]. Reprod Toxicol, 2006,21 ( 1 ) :16-20.
6Geisel J. Folic acid and neural tube defects in pregnancy : a review [ J ]. J Perinat Neonatal Nuts, 2003, l 7 (4) :268-279.
7Llanos A, Hertrampf E, Cortes F, et al. Cost-effectiveness of a folic acid fortification program in Chile [ J]. Health Policy, 2007,83 ( 2-3 ) :295-303.
8Logman JF, de Vries LE, Hemels ME, et al. Paternal organic solvent exposure and adverse pregnancy outcomes: a meta-analysis [J]. AmJIndMcd, 2005,47(1) :37-44.
9Moretti ME, Bar-OZB, Fried S, et al. Maternal hyperthermia and the risk for neural tube defects in offspring:systematic review and meta-analysis [ J]. Epidemiology, 2005,16 (2) :216-219.
10Larsson L, Lindqvist PG. Low-impact exercise during pregnancy- a study of safety[ Jl. Acta Obsted Gynecol Scand, 2005,84( 1 ) : 34-38.
