I'm hoping to find a source of data that goes back before the 1940's and I would be delighted to learn that there are places to look more for international statistics, or comparisons,even, by country. What sort of data are available? I'm especially looking for data on diseases such as diabetes, heart disease, cancer, autoimmune disease and neurodegenerative diseases like Alzheimers and Parkinson's disease. Does anyone know of some good resources? Many thanks!