1. Graduate School of Public Health, Department of Infectious Diseases and Microbiology, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Department of Medical Laboratory Sciences, Weber State University, Ogden, Utah.
3. Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland.
4. Division of Endocrinology and Metabolism, Johns Hopkins University, Baltimore, Maryland.
5. School of Public Health and Jonsson Comprehensive Cancer Center, University of California Los Angeles, Los Angeles, California.
6. Feinberg School of Medicine, Northwestern University, Evanston, Illinois.