[1
]Department of Psychology, San Diego State University, San Diego, California 92103;
email:
[2
]Department of City and Regional Planning, University of California, Berkeley, California
94720; email:
[3
]Department of Government and Economics, Claremont McKenna College, Claremont, California
91711; email:
[4
]Department of Parks, Recreation, and Tourism Management, North Carolina State University,
Raleigh, North Carolina 27695; email:
[5
]The Robert Wood Johnson Foundation, Princeton, New Jersey 08543-2316; email: