He is now a member of the exchange's new advisory panel.
The advisory panel will meet for three days beginning on Wednesday.
The advisory panel will now be called to consider whether, in light of new information, the ban should continue while safety studies are done.
The advisory panel will review the limitation on hours after one year.
A Presidential advisory panel recommended last week a bill of rights for patients.
The advisory panel is expected to vote tomorrow whether to recommend that step.
The advisory panel concluded in February that each system needed more work.
He suggested that the Treasury set up an outside advisory panel.
After two years of work, a Federal advisory panel reported last year that it was deeply split about which approach to take.
The agency usually follows the advice of its advisory panels.