Solution to storage problem
1. Discovery in 1894 by British scientists that certain acids in a soluble solution could prevent clotting
2. Discovery in 1915 by American Doctor Richard Lewerson that adding sodium citrate to blood stopped clotting
3. Discovery in 1915 by Richard Vile that blood could be refrigerated and stored for 48 hours
4. Discovery in 1916 by Francis Rouse and James Turner that adding citrate glucose solution allowed blood to be stored for up to four weeks