1Basso O,Olsed,ChristensenK.Recurrence risk of congenitalanoma- lies-the impact of paternal, social, and environmentalfactors:a popula- tion-based study in Deumark [J ].Am J Epidemiol,1999,150(6):598- 604.
5Gaspari L, Paris F, Jandel C, et al. Prenatal environmen- tal risk factors for genital malformations in a population of 1442 French male newborns: a nested case -control study [ J ]. Human Reproduction,2011,26 ( 11 ) : 3155.
6Suarez L, Felkner M, Brender JD, et al. Maternal expo- sures to cigarette smoke , alcohol, and street drugs and neural tube defect occurrence in offspring [ J ]. Matern Child Health,2008,12 ( 3 ) : 394 - 401.
7Comes TS, Lindner U. Tennekoon KH, et al. Homocys- teine in small - for - gestational age and Appropriate - for- gestational age preterm neonates from mothers re- ceiving folic acid supplementation [ J ]. Clin Chem Lab Med,2010,48 ( 8 ) : 1157 - 1161.
8Timmermans S, Jaddoe VWV, Hofman A, et al. Fericon- ception folio acid supplementation, fetal growth and the risks of low birth weight and preterm birth :the Genera- tion R Study [ J ]. British Journal of Nutrition,2010, 102 (5) :777.
