Optimized Probability Sampling of Study Sites to Improve Generalizability in a Multisite Intervention Trial by Jennifer L. Kraschnewski, MD, Thomas C. Keyserling, MD, MPH, Shrikant I. Bangdiwala, PhD, Ziya Gizlice, PhD, Beverly A. Garcia, MPH, Larry F. Johnston, MA, Alison Gustafson, RD, MPH, Lindsay Petrovic, Russell E. Glasgow, PhD, Carmen D. Samuel-Hodge, PhD, MS, RD

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