Page announced on his Google+ profile in May 2013 that his right vocal cord is paralyzed from a cold that he contracted the previous summer, while his left cord was paralyzed in 1999.[37] Page explained that he has been suffering from a vocal cord issue for fourteen years and, as of his May 2013 post, doctors were still unable to identify the exact cause of the problem. The Google+ post also revealed that Page had donated a considerable sum of money to a vocal cord nerve function research program at the Voice Health Institute in Boston, U.S—an anonymous source has stated that the donation exceeds US$20 million.[38]