The Association Between Race, Obesity, and Sperm Quality Among Men Attending a University Physician Practice in Washington, DC oleh Nathan L. McCray, Heather A. Young, Michael S. Irwig, David Frankfurter, Arnold M. Schwartz, Jeannine Witmyer, Marijane Hynes, Vimala V. Jayanthi, Mia Marcus, Mihir Patel, Melissa J. Perry