Recruitment strategies in the prostate, lung, colorectal and ovarian (PLCO) cancer screening trial: The first six years by Simpson, Nancy K., Cole Johnson, Christine, Ogden, Sheryl L., Gamito, Eduard, Trocky, Nina, McGuire, Colleen, Martin, Jamaal, Barrow, Sarah, Lamerato, Lois, Flickinger, Lynn M., Broski, Karen G., Engelhard, Deborah, Hilke, Cindy, Bonk, Janet, Gahagan, Betsy, Gren, Lisa H., Childs, Jeffery, Lappe, Karen, Fouad, Mona, Thomson, Joanice, Sullivan, Dorothy

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