A former top Kosovo health ministry official on trial for organ trafficking on Friday admitted that illegal kidney transplants were carried out at a Pristina clinic, but denied covering them up.

Ilir Rrecaj told an EU-led panel of judges that the "transplants happened, but there was no licence for (them)" at the Medicus clinic.

The United Nations on Friday presented a list of recommendations, including a strict hygiene culture and keeping different breeds of animals apart, to try to curb the spreading of the H7N9 flu virus which has killed six people in China.

"With the virus harder to detect, good biosecurity measures become even more essential to reducing the risk of virus transmission to humans and animals," said Juan Lubroth, the chief veterinary officer of the U.N.'s Food and Agriculture Organisation (FAO).

After a decade-long battle over access to emergency contraception, a federal judge ordered U.S. regulators Friday to make the morning-after pill available over the counter without age limits.

U.S. District Court Judge Edward Korman ruled that a 2011 decision by the chief of U.S. Health and Human Services to require teens under 17 to obtain a prescription was "politically motivated" and "scientifically unjustified."

A second Chinese city culled birds Saturday to prevent the spread of H7N9 avian influenza, which has killed six people in the country, as Shanghai's live poultry markets remained shut.

China has confirmed 16 cases of the H7N9 strain, the health ministry said, since announcing a week ago that the virus had been found in humans for the first time.

British scientists have used a custom-made 3D printer to make living tissue-like material that could one day serve medical purposes, according to findings released Thursday.

The material is made up of thousands of connected water droplets, encapsulated within lipid films, that can carry out some of the functions of human cells.

Shanghai ordered all live poultry markets in the city closed on Friday after culling more than 20,000 birds to curb the spread of the H7N9 flu virus, which has killed six people in China.

The latest fatality was a 64-year-old farmer who died in Huzhou, in the eastern province of Zhejiang, local officials said according to the state Xinhua news agency.

Authorities in Shanghai began the mass slaughter of poultry at a market after the H7N9 bird flu virus, which has killed five people in China, was detected there, state media reported Friday.

The new strain of the bird flu virus was detected in samples of pigeon, sparking the closure of the market, Xinhua news agency reported.

Dementia costs more each year in the United States than cancer or heart disease, with annual costs ranging from $157 billion to $215 billion, according to a study released Wednesday.

Much of the costs come from long-term care giving, and the price tag is expected to more than double by 2040, said the study by the non-profit RAND Corporation in the April 4 edition of the New England Journal of Medicine.

In a double blow, bald men may be at higher risk of coronary heart disease, said a study Wednesday, but only if the hair is lost at the crown.

Men who bald from the front appear to carry no significant added risk for the clogged artery disease that can cause heart attacks, said a report in the online journal BMJ Open.

In a worrisome sign, a bird flu in China appears to have mutated so that it can spread to other animals, raising the potential for a bigger threat to people, scientists said Wednesday.

So far the flu has sickened nine people in China and killed three. It's not clear how they became infected, but there's no evidence that the virus is spreading easily among people.