Amid continued concern about errors by overworked medical residents, hospitals would be forced to curtail shifts and increase supervision of some doctors-in-training under proposed new guidelines for residency programs. The plan from the Accreditation Council for Graduate Medical Education goes well beyond previous efforts to limit work hours. Many patient advocates and physicians hailed it as a step in the right direction, but it would likely pose logistical and financial challenges for teaching hospitals, the Wall Street Journal reports.