Donald F. Gleason (November 20, 1920 – December 28, 2008) was an American physician and pathologist, best known for devising the "Gleason score" which predicts the aggressiveness of prostate cancer in patients. He was a former chief of pathology at the Minneapolis VA Medical Center, and received three degrees from and taught at the University of Minnesota. Using only the above description and what you know about the world, "Donald Gleason received four degrees from the University of Minnesota." is definitely correct, incorrect, or inconclusive? 