Ping An, George W. Nelson, Lihua Wang, Sharyne Donfield, James J. Goedert, John Phair, David Vlahov, Susan Buchbinder, William L. Farrar, William Modi, Stephen J. O'Brien, Cheryl A. Winkler
Proc Natl Acad Sci U S A. 2002 Jul 23; 99(15): 10002–10007. Published online 2002 Jul 11. doi: 10.1073/pnas.142313799