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NEW ORLEANS -- Almost two years after Hurricane Katrina ravaged this city, a grand jury here refused to indict Anna M. Pou, M.D., in the deaths of four elderly patients at Memorial Medical Center.

LOS ANGELES -- Exposure to the sun may be a risk factor for skin cancer, but it seems to have a protective effect against multiple sclerosis, according to a twin study.

BOSTON -- Only a minority of older breast cancer survivors undergoes recommended yearly surveillance mammography, but for those who do, the risk of dying from the disease is cut by almost a third, researchers found.

ROCHESTER, Minn. -- The old guard in medical education who predicted that shortened work hours for residents would lead to shoddy training of young physicians are claiming vindication.

BOSTON -- Hip protectors designed to lessen the impact of falls for older adults do not appear to reduce the incidence of hip fractures, researchers here found.

WHITE RIVER JUNCTION, Vt. -- Pulmonary artery catheterization decreased by 65% for all medical admissions in the U.S., from 1993 to 2004, researchers here reported.

BOSTON -- Intense lipid-lowering may raise the threat of cancer as it reduces the risk of cardiovascular disease, according to results of a large meta-analysis.

STANFORD, Calif. -- Group therapy has no impact on survival in metastatic breast cancer, according to a randomized trial here that contradicted earlier findings of a significant advantage.

ROCKVILLE, Md. -- Based on botulism toxin tests at an Augusta, Ga., food processing plant, the FDA has expanded its warning about chili dog sauce to include 10 canned sauces and four pet food products.

WASHINGTON -- The White House said today that pathology on five adenomatous polyps discovered during a colonoscopy performed on President Bush over the weekend were all benign.

HAMILTON, Ontario -- Patients are more likely to develop venous thromboembolism after hospital discharge than during their stay, and most get no prophylactic treatment.

NOTTINGHAM, England -- In many young children with intracranial ependymoma, primary chemotherapy can delay or avoid radiotherapy without compromising survival, according to investigators here.

ROCKVILLE, Md. -- Based on botulism toxin tests at an Augusta, Ga., food processing plant, the FDA has expanded its warning about chili dog sauce to include 10 canned sauces and four pet food products.

BOSTON -- Obesity's link to multiple myeloma has received new corroboration from an analysis of data from two large studies of health care professionals.

NEW YORK -- Children who take methylphenidate (Ritalin) throughout childhood may undergo behavior-modifying brain changes that carry into adulthood, or so investigators found in rats.

NEW YORK -- In the year after New York's statewide ban on indoor smoking, saliva levels of cotinine, a marker of exposure to tobacco smoke, decreased by 47.4% among nonsmokers.

SUTTON, England -- Progression-free survival in chronic lymphocytic leukemia was extended significantly over monotherapy by combining fludarabine and cyclophosphamide, found an international study. But overall survival did not improve.

GATESHEAD, England -- Playing soothing music during a colposcopy or allowing the patient to view the procedure on a television monitor were effective anxiety-reducing interventions, according to a review of 11 clinical trials.