Part 2 of 2. Who should oversee comparative effectiveness research? How should the information it produces be promulgated to physicians? And is there any basis for charges that CER will lead to health care rationing? David B. Nash, MD, MBA, the Dr Raymond C. and Doris N. Grandon Professor of Health Policy and founding dean of the Jefferson School of Population Health at Thomas Jefferson University in Philadelphia, provides an expert’s perspective on 2 issues in the current health care debate that are of particular concern to PCPs.