2004-03-22 The data were converted from card image to logical
record length format. The documentation and SPSS data definition
statements were updated to reflect the new format and SAS data
definition statements were prepared.
2005-11-04 On 2005-03-14 new files were added to one
or more datasets. These files included additional setup files as well
as one or more of the following: SAS program, SAS transport, SPSS portable,
and Stata system files. The metadata record was revised 2005-11-04 to
reflect these additions.
2006-03-30 File CB9094.ALL.PDF was removed from any previous datasets and flagged as a study-level file, so that it will accompany all downloads.