National Center for Family & Marriage Research
Copyright ©2014 National Center for Family & Marriage Research. All rights reserved.
Disclaimer: This project is supported with assistance from Bowling Green State University. From 2007 to 2013 support was also provided by the U.S. Department of Health and Human Services, Office of the Assistant Secretary for Planning and Evaluation. The opinions and conclusions expressed herein are solely those of the author(s) and should not be construed as representing the opinions or policy of any agency of the state or federal government.