Funding was provided by the School of Public and Environmental Affairs at Indiana University Bloomington. We thank Matthew Sisco for technical support, Andrew Barnes, Jared Eichmiller, Nicholas Posawatz, and Robin Saywitz for research support, and Colin Allen, Jonathan Baron, David Good, Helen Greatrex, Marybeth Shinn, and Michael Vandenbergh for comments.
S.Z.A., D.H.K., and E.U.W. designed research; S.Z.A. collected the data; S.Z.A. and D.H.K. analyzed data; and S.Z.A., D.H.K., and E.U.W. wrote the paper.