Comparison of recruitment and retention among demographic subgroups in a large diverse population study of diet by Gwen L. Alexander, PhD, Sujata Dixit-Joshi, PhD, Lawrence H. Kushi, ScD, Laura A. Coleman, PhD, Maria E. Sundaram, MSPH, Heather A. Clancy, MPH, Michelle Groesbeck, BS, Nancy A. Potischman, PhD, Sharon I. Kirkpatrick, PhD, Thea P. Zimmerman, MS, Stephanie M. George, PhD, Amy F. Subar, PhD, Frances E. Thompson, PhD

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