1Riley M. Population prevalence rates of birth ddects:A data management and epidemiological perspective [- J ] Health Information Management,2005,34(3) :94-99.
2Krapels IP, Zielhuis GA, Vroom F, et al. Periconeeptional health and lifestyle factors of both parents affect the risk of live- born children with orofaeial clefts[J]. Birth Defects Res A elin Mol Terato,2006,76(8) :613-620.
