http://sportsillustrated.cnn.com/vault/article/magazine/MAG1190863/index.htm.

Sydney Crosby was out for almost a year with a vestibular concussion, with no improvements in his condition he sought out care from Dr. Carrick. Shortly after care, crosby was asymptomatic and able to return to hockey. Although him symptoms later returned, he revisited Dr. Carrick, in addition to receiving other therapies and is now back in the line up.