Roberts, W.O. (2000). A 12-yr Profile of Medical Injury and Illness for the Twin Cities Marathon. (Abstract only.) Medicine and Science in Sports and Exercise. 32(9): 1549-1555.
The author analyzed 12 years' worth of data to determine the types of injury and illness suffered by runners in the Twin Cities Marathon. Mild injury/illness was the primary reason 90% sought medical care, and runners mainly suffered "exercise-induced collapse," skin problems, and musculoskeletal problems.