The researchers accept other causes - such as scarlet fever or a chronic heart or kidney condition - may be possible, and acknowledge the limitations of their research.

BBC: Mozart 'killed by strep throat'

But there are some limitations to the bee research, says Jonathan Eisen, a rising star in metagenomics and a professor at the University of California-Davis.

FORBES: Magazine Article

In addition to risk and burden mitigation for IPO issuers, the JOBS Act substantially reduced limitations on publication of reports and recommendations by research analysts at investment banks participating in the public offerings.

FORBES: On Its One-Year Anniversary, Two Cheers For The JOBS Act

Simultaneously, the Ministry is aware of the limitations of current international rankings, based almost exclusively on research criteria.

UNESCO: Education

The purpose of this order is to remove these limitations on scientific inquiry, to expand NIH support for the exploration of human stem cell research, and in so doing to enhance the contribution of America's scientists to important new discoveries and new therapies for the benefit of humankind.

WHITEHOUSE: THE WHITE HOUSE