[No authors listed] Physician's health study: aspirin and primary prevention of coronary heart disease. N Engl J Med. 1989 Dec 28, 321(26), 1825-1828. [PMID]: 2594041.
[No authors listed] Final report on the aspirin component of the ongoing Physicians' Health Study. Steering Committee of the Physicians' Health Study Research Group. N Engl J Med. 1989 Jul 20, 321(3), 129-135. [PMID]: 2664509.