海量图书期刊资源,随时随地畅享阅读乐趣
Missing Data in a Long Food Frequency Questionnaire: Are Imputed Zeroes Correct?Gary E. Fraser, Ru Yan, Terry L. Butler, Karen Jaceldo-Siegl, W. Lawrence Beeson and Jacqueline Chan · Epidemiology · 2009
Feasibility of Running Clinics to Collect Biological Specimens in a Nationwide Cohort Study—Adventist Health Study-2Jacqueline Chan; Synnove F. Knutsen; Joan Sabate; Ella Haddad; Ru Yan; Gary E. Fraser · 2007
Black art posters, an incentive to increase study enrollment among Blacks in a large cohort studyAntronette K. Yancey; R. Patti Herring; Gary E. Fraser; Ru Yan; Phyllip Baker; Andrew Lampkin; James Kyle · 2008