[1] Georgetown Univ, Ctr Child & Human Dev, 2115 Wisconsin Ave NW,6th Floor, Washington, DC 20007 USA
[2] Arizona State Univ, Childrens Equ Project, POB 871811,Farmer Room 438A, Tempe, AZ 85287 USA
[3] Child Trends, 7315 Wisconsin Ave,Suite 1200W, Bethesda, MA 20814 USA
[4] Univ Virginia, Ctr Adv Study Teaching & Learning, 405 Emmet St South, Charlottesville, VA 22904 USA