[1] Vanderbilt Univ, Nashville, TN 37240 USA
[2] Penn State Univ, University Pk, PA 16802 USA
[3] Univ Washington, Seattle, WA 98195 USA
[4] Univ Arkansas, Little Rock, AR 72204 USA
[5] Univ Pittsburgh, Pittsburgh, PA 15260 USA
[6] Univ N Carolina, Chapel Hill, NC USA
[7] Univ Calif Irvine, Irvine, CA 92717 USA
[8] NICHHD, Bethesda, MD 20892 USA
[9] Temple Univ, Philadelphia, PA 19122 USA
[10] Univ Kansas, Lawrence, KS 66045 USA
[11] Wellesley Coll, Wellesley, MA 02181 USA
[12] Univ New Hampshire, Durham, NH 03824 USA
[13] Univ Texas Dallas, Dallas, TX 75230 USA
[14] Univ Virginia, Charlottesville, VA 22903 USA
[15] Univ Wisconsin, Madison, WI USA