Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Conference on Health Survey Research Methods 1999 : Williamsburg, Va.), author.
Publication:
Hyattsville, Maryland : U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics, February 2001
[Bethesda, Md.] : Contraceptive Development Branch, Center for Population Research, National Institute of Child Health and Human Development in collaboration with the World Health Organization, [1992]