• It was an observational study.

    VOA: special.2009.09.01

  • So when you put these observational studies together with a 'gold standard' clinical trial, the findings are overwhelming."

    VOA: standard.2010.07.21

  • "In the observational studies we found that some of the B vitamins, like folic acid,were beneficial."

    VOA: standard.2010.06.17

  • "I think there have been some observational,smaller studies that suggested the same thing.

    VOA: standard.2010.07.21

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