But failing to perform such a study runs a significant chance of confusing cause and effect.
However, he did add that a number of the sites included in the study did not perform well.
HeartWare said that the FDA was requiring the company to perform a post-approval study in the form of a registry consisting of 600 HeartWare patients and an additional 600 control patients.
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The Marine Corps has opened Infantry Officers Course for a pilot program to study how well women could perform in combat roles.
They brought in a second set of study participants and asked them to perform the same four mental tasks.
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Although there is still limited empirical evidence on the relative performance of socially responsible investing in comparison to conventional investing, one 2000 study concluded that social mutual funds perform no better or worse than conventional mutual funds.
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Researchers recruited 48 adults for the study who were asked to learn and perform a specific finger pattern (pushing keys on a keyboard in a particular sequence as fast as possible in 30 seconds).
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Eve Knight, from the British Cardiac Patients' Association, said the study highlighted the need for all hospitals to perform to the highest standards.
Results from the clinical study show that most participants were able to perform basic activities better with the Argus II Retinal Prosthesis System than without it.
That assessment was reinforced by a 2009 Northrop Grumman study that found seven Littoral Combat Ships could perform anti-piracy patrols in the Western Indian Ocean more efficiently than 20 conventional warships for a quarter of the cost.
Four professors at IMD business school, Penn State, and Erlangen-Nuremberg University have collaborated on a study that finds that chief executives who are serious narcissists perform better than more normal top bosses.
The study also cites academic research that shows companies with lower executive salaries perform worse than others.
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Second, the study does not look at whether government agencies or private firms could perform good works more efficiently than charities do.
William Weintraub, chief of cardiology at Christiana Care Health System in Delaware and the study's lead investigator, said the results call for more collaboration between heart surgeons who perform bypass surgeries and interventional cardiologists who deploy stents to make sure patients are carefully evaluated and informed of their options before their procedures.
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