JAMA/Archives has issued a special notice:
SPECIAL NOTICE: The embargo on the Archives of Internal Medicine paper (see below) was broken by Jonathan Leake of The Sunday Times of London. In response to this violation, reporters and editors at The Sunday Times will no longer have pre- or post-embargo access to any JAMA/Archives materials.
I think, perhaps, that other journals should preemptively ban The Sunday Times. I’m not going to link to Leake’s story — the BBC story on the study is here.