1. Blue Cross Blue Shield of Massachusetts; Beth Israel Deaconess Medical Center; Massachusetts General Hospital-Harvard Medical School; Brigham and Women's Hospital and Dana-Farber Cancer Center; Boston Medical Center and Boston University School of Medicine; Tufts Medical Center, Boston; Baystate Medical Center, Springfield; St Vincent Hospital; University of Massachusetts Medical Center and University of Massachusetts Medical School, Worcester; Shields Health Care Group, Quincy; and Lahey Hospital and...