... Data¹

Available from http://GKing.Harvard.Edu/va via a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0, for academic use only

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... King²

David Florence Professor of Government, Harvard University (Institute for Quantitative Social Science, 1737 Cambridge Street, Harvard University, Cambridge MA 02138; http://GKing.Harvard.Edu, King@Harvard.Edu, (617) 495-2027).

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... Lu³

Assistant Professor, Department of Sociology, University of Colorado at Boulder (3E Ketchum Hall, UCB 327, Boulder, CO 80309. ylu@colorado.edu, 303-492-7030)

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