Referees (IMAGE) Tufts University, Health Sciences Campus Caption A collaborative effort is needed to ensure the long-term health of offensive linemen. Credit Keith, <a target="_blank"href="https://pixabay.com/en/american-football-1464551/">Pixabay.com public domain image</a> Usage Restrictions <a target="_blank"href="https://creativecommons.org/publicdomain/zero/1.0/deed.en">CC0 Public Domain</a> License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.