Oxford Journals
Oxford University Press
From the Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD.
NOTES
Reprint requests to Dr. Genevieve Matanoski, Johns Hopkins Bloomberg School of Public Health, 111 Market Place, Suite 850, Baltimore, MD 21202.
Received for publication September 12, 2000. Accepted for publication May 31, 2001.