Acknowledgment: We thank the following clinics for their participation in the study: Roosevelt GIMC Clinic and Adult Medicine Clinic, Harborview Medical Center, University of Washington, Seattle; Family Health Center and Les Kelly Family Health Center, University of California, Los Angeles; Valley Internal Medicine Group, Los Angeles; Family and Preventive Medicine Group and La Jolla Internal Medicine Group, University of California, San Diego. We would also like to acknowledge the helpful support of clinic directors and staff: Michelle Bholat, MD, MPH, David Dugdale, MD, Daniel Lessler, MD, Burt Liebross, MD, Bob Maurer, PhD, Martin Schulman, MD, Janine Parker, MD, and Jennifer Wu, MD. Adrienne Means-Christensen, PhD, Erin Michelson, BA, Holly Hazlett-Stevens, PhD, and Bobby Verdugo, PhD, coordinated our research efforts. Denise Chavira, PhD; Leslie Zeigenhorn, PhD; Jonathan Bricker, PhD; Jonathan Kantor, PhD; Erin Dunn, PhD; Bonnie Zucker, PhD, Tyler Story, MA, and Barbara Paris, MA, served as behavioral health specialists. Bernadette Benjamin, MS, provided database management and programming support. Finally, we would like to acknowledge the contributions of the Data Safety Monitoring Board (Mark Sullivan, MD; Emmett Keeler, PhD; and Dennis Munjack, MD), the Scientific Advisory Board (Ken Wells, MD; Richard Veith, MD; and Lewis Judd, MD), the Primary Care Advisory Board (Elizabeth Lin, MD, and Joseph Lieberman, MD), and the Ethnic Advisory Board (Jeanne Miranda, PhD; Peter Guarnaccia, PhD; Maja Jackson-Triche, MD; and David Takeuchi, PhD).