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https://phgkb.cdc.gov/GAPPKB/phgHome.do;jsessionid=2A60FE82FED3CFC6907A59D3FD1CBE0A?Mysubmit=init&query=birth+defects&action=search&Mysubmit=Search&selectedModelList=cdcInfo&selectedModelList=insight&selectedModelList=epi&selectedModelList=translational&selectedModelList=evidence&selectedModelList=practice