Cycling or walking to school increases a child's ability to concentrate in the classroom, the results of a Danish study published Friday showed.

Children who were driven to school, or who took public transport, performed less well in a test measuring concentration levels, than those who had walked or cycled, a joint study by researchers at the universities in Copenhagen and Aarhus found.

Ranbaxy Pharmaceuticals Inc. has recalled dozens of lots of its generic version of cholesterol drug Lipitor because some may contain tiny glass particles, the latest in a string of manufacturing deficiencies that once led U.S. regulators to bar imports of the Indian company's medicines.

Ranbaxy, a subsidiary of Ranbaxy Laboratories Ltd., India's biggest drugmaker, is operating under increased scrutiny from the U.S. Food and Drug Administration because of quality lapses at multiple Ranbaxy factories over the past several years. The FDA also has alleged the company lied about test results for more than two dozen of its generic drugs several years ago.

Philippine President Benigno Aquino will not quit smoking despite the country's top medical body publicly appealing for him to lead by example and kick the habit, his spokesman said Saturday.

The Philippine Medical Association called on Aquino to give up after noticing his frequent coughing, spokesman Edwin Lacierda told government radio.

Another person has died of a mysterious respiratory virus and three more cases have been discovered in Saudi Arabia and Qatar, the World Health Organization said Friday.

"This brings the total of laboratory-confirmed cases to six," the Geneva-based U.N. agency said in a statement.

China has banned health institutions from withholding care to people with HIV/AIDS after an outcry over a cancer patient with the disease who was denied treatment, state media reported.

The Ministry of Health issued a memo Friday ordering authorities to take steps to guarantee the right to medical treatment for people with the disease, according to the official Xinhua news agency.

Ten years ago there was not a single midwife in the Afghan town of Baharak. Today there are four and the number of women dying in childbirth has fallen dramatically.

Care may still be basic by Western standards, but new midwives like Nasira Karimi mean that in 10 years Afghanistan has seen a staggering improvement in maternal health.

An Emirates Airlines flight was forced to make an emergency landing in Warsaw on Friday after a passenger became fatally ill, airport officials said, echoing a similar event two weeks ago in Prague.

"Medics boarded the plane after the emergency landing early this morning, but were unable to revive the female passenger," Przemyslaw Przybylski, a spokesman for the Polish capital's Chopin Airport, told Agence France Presse.

Older teens and adults with attention deficit disorder are much less likely to commit a crime while on ADHD medication, a provocative study from Sweden found.

It also showed in dramatic fashion how much more prone people with ADHD are to break the law — four to seven times more likely than others.

They came from the remotest parts of Indonesia, taking crowded overnight ferries and riding for hours in cars or buses — all in the hope that a simple, and free, surgical procedure would restore their eyesight.

Many patients were elderly and needed help to reach two hospitals in Sumatra where mass eye camps were held earlier this month by Nepalese surgeon Dr. Sanduk Ruit. During eight days, more than 1,400 cataracts were removed.

Mammograms have done surprisingly little to catch deadly breast cancers before they spread, a big U.S. study finds. At the same time, more than a million women have been treated for cancers that never would have threatened their lives, researchers estimate.

Up to one-third of breast cancers, or 50,000 to 70,000 cases a year, don't need treatment, the study suggests.