RT Journal Article SR Electronic T1 ASPO Distinguished Achievement Award Lecture. Epidemiological studies using biological markers: issues for epidemiologists. JF Cancer Epidemiology Biomarkers & Prevention JO Cancer Epidemiol Biomarkers Prev FD American Association for Cancer Research SP 13 OP 19 VO 1 IS 1 A1 Hulka, B S YR 1991 UL http://cebp.aacrjournals.org/content/1/1/13.abstract AB