- Research finds ultramarathon running is a risk factor for colorectal cancer Boing Boing
- Are Marathons and Extreme Running Linked to Colon Cancer? The New York Times
- This health nut habit may actually increase your colorectal cancer odds: ‘You never hear it’s bad for you’ New York Post
- Are Marathon Runners More Likely to Get Cancer? VICE
- Marathon running can lower your risk of colon cancer; know what study says The Times of India
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