The polyp prevention trial I: rationale, design, recruitment, and baseline participant characteristics.
Schatzkin A, Lanza E, Freedman LS, Tangrea J, Cooper MR, Marshall JR, Murphy PA, Selby JV, Shike M, Schade RR, Burt RW, Kikendall JW, Cahill J.
Schatzkin A, et al.
Cancer Epidemiol Biomarkers Prev. 1996 May;5(5):375-83.
Cancer Epidemiol Biomarkers Prev. 1996.
PMID: 9162304
Clinical Trial.