The 31-year-old Venus Williams has had nearly every injury in the book, but she offered an unusual reason this time around: Sjögren's syndrome, a poorly understood autoimmune disorder that causes joint pain and can deplete energy levels. As many as 4 million Americans have Sjögren's syndrome according to the Sjögren's Syndrome Foundation, making it the second most common autoimmune disease after rheumatoid arthritis, and ahead.
http://www.cnn.com/2011/09/01/health/sjogrens-syndrome-venus-williams/index.html
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