1. National Institute of Dental Research, National Institutes of Health, U.S. Public Health Service, Bethesda, Maryland U.S. Army Medical Research and Nutrition Laboratory, Fitzsimmons Hospital, Denver, Colorado
2. National Institute of Dental Research, National Institutes of Health, U.S. Public Health Service, Bethesda, Maryland, U.S. Army Medical Research and Nutrition Laboratory, Fitzsimmons Hospital, Denver, Colorado