A Zajacova1, J B Dowd2. 1. Department of Sociology, University of Wyoming, Dept. 3293, 1000 E University Ave, Laramie, WY, USA. Electronic address: zajacova@uwyo.edu. 2. Epidemiology and Biostatistics, CUNY School of Public Health, Hunter College, City University of New York (CUNY), New York, NY, USA; CUNY Institute for Demographic Research (CIDR), New York, NY, USA.