[1] Georgetown Univ, Washington, DC 20057 USA
[2] Utah State Univ, Logan, UT 84322 USA
[3] Univ Illinois, Chicago, IL USA
[4] Univ Minnesota, Minneapolis, MN USA
[5] Vanderbilt Univ, 221 Kirkland Hall, Nashville, TN 37235 USA
[6] Amer Univ, Washington, DC USA
[7] Texas A&M Univ, College Stn, TX USA
[8] Univ Wisconsin, Madison, WI USA
[9] Univ Calif Irvine, Irvine, CA USA
[10] Concordia Univ, Montreal, PQ, Canada
[11] Univ Chicago, Chicago, IL 60637 USA
[12] Johns Hopkins Univ, Baltimore, MD USA