There is so much missing data that I am exploring use of the Ambulatory Health Care Data on Emergency Department Length of Stay.
After searching through all of this, I found NAMCS and NHAMCS data can also be downloaded from the Inter-University Consortium for Political and Social Research (ICPSR)
I am also analyzing Semantic Medline. http://semanticommunity.info/A_NITRD_Dashboard/Semantic_Medline
Joined 13 Mar '12 Email user
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The deadline for using external data was two days ago - as far as I can tell - if it isn't listed here:
it can't be used.
However - if you have already made a prediction using that data - it seems like one could read that the deadline for TELLING everyone is April 11, 2012.
And apparently you can ask for approval as well - but you might want to post in that thread.