@techreport{NCHS (National Center for Health Statistics)2017,
author = {NCHS (National Center for Health Statistics)},
title= {User guide to the 2017 Natality Public Use file},
year = {2017},
URL = {https://www.cdc.gov/nchs/data_access/vitalstatsonline.htm},
publisher = {Centers for Disease Control and Prevention},
address = {Atlanta},
}