Governmental health records and survey data. A lot of the really big stuff we use requires academic licenses, but there's still a lot of publicly accessible dat

Governmental health records and survey data. A lot of the really big stuff we use requires academic licenses, but there's still a lot of publicly accessible data. For the U.S. try - CDC's National Center for Health Statistics: http://www.cdc.gov/nchs/ http://www.cdc.gov/nchs/ - CDC WONDER: http://wonder.cdc.gov/ http://wonder.cdc.gov/ - NIH's Unified Medical Language System: http://www.nlm.nih.gov/research/umls/ http://www.nlm.nih.gov/research/umls/ And for global try the Global Health Data Exchange: http://ghdx.healthdata.org http://ghdx.healthdata.org