The study is said to be the first to examine in detail measurements of bone strength instead of bone density.

VOA: special.2009.03.10

The study found that smokers who quit had a seventy percent increased risk of developing the disease in the first six years.

VOA: special.2010.01.13

At first,the study involved about five thousand people in the American state of Massachusetts.

VOA: special.2009.12.22

"Our study showed for the first time a clear difference between oxygen and air in the treatment of acute cluster headache.

VOA: standard.2009.12.17