Data sharing statement in journal

The BMJ is asking authors to end their article with a Data sharing statement.
See: http://www.bmj.com/cgi/content/full/338/mar25_1/b1252
It does not oblige the author to actually share their data, but it is a first step in thinking about the underlying data and also to make the underlying data slightly more transparent. I wonder when further journals will follow.
(Off the SOAN blog.)