1. a Stanford University , 509 CERAS, SCANCOR Building, Stanford , CA , 94305 , USA
2. b Department of Management and Policy , University of Arizona , 405 McClelland Hall, Tucson , AZ , 85721 , USA
3. c Department of Sociology , University of Arizona , Tucson , AZ , 85721 , USA
4. d Department of Sociology , Boston University , Cummington Street, Boston , MA , 02215 , USA