1. From Biostatistics, Arbor Research Collaborative for Health, Ann Arbor, Michigan (Dr Zee); the Departments of Pathology (Dr Hodgin), Internal Medicine (Dr Mariani), and Biostatistics (Dr Gillespie), University of Michigan, Ann Arbor; Arbor Research Collaborative for Health, Ann Arbor, Michigan (Dr Mariani); the Department of Pathology & Immunology, Washington University, St Louis, Missouri (Dr Ga