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PHILADELPHIA -- The rising rate of Caesarean deliveries might be slowed by preventive labor induction, researchers here said.

WELLINGTON, New Zealand -- Smoking a single marijuana joint by a heavy user can cause bronchial damage similar to smoking 2.5 to five cigarettes, researchers reported.

LONDON -- Air polluted with even declining levels of black smoke and sulphur dioxide can still increases the risk of premature death, according to British health data.

SEATTLE -- Screening MRI had a higher rate of breast cancer detection than either mammography or ultrasound screening in high-risk women, but it nearly quadrupled the biopsy rate, researchers here found.

ROCKPORT, Me. -- Chief Justice John Roberts had a benign idiopathic seizure today at his summer home near here and was hospitalized as a precaution, according to the Supreme Court.

CHICAGO -- Racial and ethnic differences in the rate at which older adults with arthritis become disabled by the condition may be largely a function of overall health and access to care, researchers found.

DURHAM, N.C. -- The response rate in renal cell carcinoma more than tripled with both an immunomodulator and an angiogenesis inhibitor compared with typical results with either drug alone, investigators here found.

RIGA, Latvia -- Percutaneous coronary intervention (PCI) with cutting balloon pre-treatment of lesions may be a good therapeutic option for left main artery stenosis, a transoceanic team of investigators affirmed.

ATLANTA -- A spike in outbreaks of cryptosporidiosis in 2006 has spurred the CDC to launch an initiative this summer to improve the safety of swimming pools and other recreational water facilities.

BOSTON -- New genetic contributors to multiple sclerosis have been uncovered for the first time in 35 years, according to researchers here.

ROCKVILLE, Md. -- Tegaserod (Zelnorm), the irritable bowel syndrome and constipation drug pulled from the market last spring, will make a limited return under an FDA plan that permits its use in certain symptomatic women younger than 55.

DALLAS -- A 30-minute, video-based cardiopulmonary resuscitation course (CPR) is as effective as a traditional 3-hour course, with possibly better retention at six months, researchers here found.

ATLANTA -- Horseback riding causes the highest proportion of traumatic brain injuries among sports-related recreational, activities, according to the CDC. For brain injuries, ice skating is next.

BIRMINGHAM, Ala. -- Enzyme replacement therapy plus two classes of renin inhibitors stabilized kidney function in patients with severe Fabry's nephropathy, researchers reported.

OXFORD, England -- The cardiovascular risk of rofecoxib (Vioxx), the now-withdrawn Cox-2 inhibitor, increased from the start of treatment rather than after an 18-month delay, found researchers here.

ANN ARBOR, Mich. -- Partial thrombosis of the false lumen created after a dissection in the descending aorta is a strong predictor of death after hospital discharge, researchers found.

PORTLAND, Ore. -- Researchers here believe they've successfully tied a recent decline in breast cancer incidence to the rapid drop in use of hormone replacement therapy after 2002.

ATLANTA -- Americans are having trouble sifting fact from fiction on the causes of cancer, according to a survey released today.