By Rob Waters, Mar. 20, 2008 (Bloomberg)- An international group of scientists is establishing guidelines for stem-cell therapies because clinics in China, Costa Rica and Barbados are using unproven treatments on sick patients.

``If you go online, you can find dozens of sites that offer unproved therapies,'' George Daley, a researcher with the Harvard Stem Cell Institute in Boston and president of the International Society for Stem Cell Research, said at a press conference in Half Moon Bay, California...