20210206214500.0 0147-3956 Maryland Advance data from Vital & health statistics of the National Center for Health Statistics. http://purl.access.gpo.gov/GPO/LPS71450 Advance data from vital and health statistics of the National Center for Health Statistics 0147-3956 0147-3956 0147-3956 http://www.cdc.gov/nchs/products/pubs/pubd/ad/ad.htm 0147-3956 Advance data from vital and health statistics of the National Center for Health Statistics Advance data from Vital & health statistics of the National Center for Health Statistics.