Citation Select	Sandler RS, Halabi S, Baron JA, Budinger S, Paskett E, Keresztes R, Petrelli N, Pipas JM, Karp DD, Loprinzi CL, Steinbach G, Schilsky R A randomized trial of aspirin to prevent colorectal adenomas in patients with previous colorectal cancer N Engl J Med. 2003 Mar 6;348(10):883-90