1. American College of Physicians, Philadelphia, Pennsylvania (A.Q.)
2. David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California (C.J.C.)
3. University of Kansas Medical Center, Kansas City, Kansas (R.A.M.)
4. Centers for Disease Control and Prevention, Atlanta, Georgia (L.A.H.)
5. Minneapolis Veterans Affairs Medical Center, Minneapolis, Minnesota (T.J.W.)