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PITTSBURGH -- Teenagers who believe that wealthy, successful people smoke are more likely to become smokers themselves, researchers here reported.

COLUMBUS, Ohio -- Boys with Duchenne muscular dystrophy are able to walk more than three years longer if they take daily corticosteroids, according to researchers here.

SEATTLE -- Few geriatricians appear willing to try newer medications to treat chronic constipation in older adults, an informal survey here showed.

SEATTLE -- Hospitalized older patients spend too long flat on their back, a situation prompted at least in part by a hospital culture that discourages mobility, researchers said here.

SEATTLE -- Opioid-induced constipation in advanced cancer is relieved for more than half of patients within four hours by a subcutaneous injection of methylnaltrexone, researchers here reported.

SEATTLE -- Giving older type 2 diabetic patients a pedometer and a goal to meet may be enough to get them moving, researchers said here.

BETHESDA, Md. -- About one American in 10 has had a problem with legal or illegal drug use, according to researchers here.

SEATTLE -- Sex remains an important part of life for many older Americans even as they develop more sexual problems as they age, researchers here reported.

SAN FRANCISCO -- Reducing levels of one of the proteins involved in Alzheimer's disease appears to prevent some of memory loss and learning difficulties -- at least in experimental mice.

SEATTLE -- Elderly trauma patients are at a disproportionate mortality risk from even minor abdominal organ injuries, researchers reported here.

SEATTLE -- Interdisciplinary primary care using condition-specific protocols improved health and functioning of low-income seniors, researchers reported here.

OULU, Finland -- Tonsillectomy is an effective remedy for adults with recurrent bouts of group A streptococcal pharyngitis, according to researchers here.

SEATTLE -- Gastric acid suppression with proton pump inhibitors appears to hold no excess risk of pneumonia in hospitalized older adults, researchers reported here.

ZURICH -- Wearing protective clothing is better than using sunscreens to prevent skin cancer and hold off the aging effects of solar rays, said investigators here.

SEATTLE -- Light, physical activity and other non-drug therapies may be as effective against insomnia in the elderly as pharmacologic interventions, researchers said here.

OTTAWA, May 3 -- The risk of heart disease increases in the presence of a common genetic variation carried by about 20% of Caucasians, according to two reports published online today in Science.

BOSTON -- Women who took estrogen before age 65 may not be at a higher risk of later dementia, as previously reported, said investigators here.

BOSTON -- Migraine headaches among veterans of combat in Iraq indicate a more than twofold risk for depression, post-traumatic stress disorder, and anxiety, reported military researchers.