Aspirin in Preventing Colorectal Cancer in Patients With Colorectal Adenoma
National Cancer Institute (NCI)
National Cancer Institute (NCI)
Canadian Cancer Trials Group
Massachusetts Eye and Ear Infirmary
National Cancer Institute (NCI)
Roswell Park Cancer Institute
Oslo University Hospital
National Institutes of Health Clinical Center (CC)
University College, London
Fundacion CRIS de Investigación para Vencer el Cáncer
University Hospital, Antwerp
Leiden University Medical Center