and commentary also appear in ACP Journal Club. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . For correspondence: Dr R G Barr, Columbia-Presbyterian Medical Center, New York, NY, USA. [email protected] Sources of funding: National Institutes of Health; Robert Wood Johnson Generalist Physician Faculty Scholar Award; Cana...