1. Joshua A. Barocas, Jianing Wang, Jake R. Morgan, and Benjamin P. Linas are with the Division of Infectious Diseases, Department of Medicine, Boston University School of Medicine and Boston Medical Center, Boston, MA. Laura F. White is with the Department of Biostatistics, Boston University School of Public Health. Alexander Y. Walley, Marc R. LaRochelle, and Jeffrey H. Samet are with the Clinical Addiction Research and Education Unit, Section of General Internal Medicine, Department of Medicine, Boston...