Mukamel Dana B, Weimer David L, Mushlin Alvin I
Department of Medicine, Division of General Internal Medicine and Primary Care, Center for Health Policy Research, University of California, Irvine, California 92697-5800, USA.
Med Care. 2007 Dec;45(12):1227-32. doi: 10.1097/MLR.0b013e31812f56bb.