http://kidney.niddk.nih.gov/kudiseases/pubs/stonesadults/
National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health
Kidney stones are one of the most common disorders of the urinary tract. More than 1 million cases of kidney stones were diagnosed in 1985. It is estimated that 10 percent of all people in the United States will have a kidney stone at some point in time. Men tend to be affected more frequently than women.