Advance data from Vital& health statistics of the National Center for Health Statistics [elektronický zdroj]. Rockville, Md. : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, 1976-[2008]. v. 1977-1980: DHEW publication ; no. (PHS)1981- : DHHS publication ; no. (PHS). Mode of access: World Wide Web from the NCHS web site. Address as of 6/28/06: http://www.cdc.gov/nchs/products/pubs/pubd/ad/ad.htm; current access is available via PURL. Dostupné na internetu: <http://sfx.jib.cz/sfxlcl3?url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/sfxit.com:opac_856&url_ctx_fmt=info:ofi/fmt:kev:mtx:ctx&sfx.ignore_date_threshold=1&rft.object_id=954927614953&svc_val_fmt=info:ofi/fmt:kev:mtx:sch_svc&>