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Cai Changgui (Chinese: 蔡长贵, born 15 April 1983) is a Chinese goalball player. He won a gold medal at the 2008 Summer Paralympics. He competed in the 2012 Summer Paralympics despite an infection and the doctor's bed-rest order, after sneaking out of the hospital. Cai lost his eyesight when he was 10 years old, due to a medical accident involving an injection.