1. From Erasmus University Medical Center, Rotterdam, the Netherlands; Fred Hutchinson Cancer Research Center and Group Health Research Institute, Seattle, Washington; National Cancer Institute, Bethesda, Maryland; Albert Einstein College of Medicine, Yeshiva University, Bronx, New York; Massachusetts General Hospital, Boston, Massachusetts; University of Minnesota, Minneapolis, Minnesota; Memorial Sloan Kettering Cancer Center, New York, New York; and Georgetown University, Washington, DC.