| http://www.w3.org/ns/prov#value | - When you experience any of the following: back pain that comes on suddenly for no apparent reason, back pain that is accompanied by other symptoms such as fever, stomach cramps, chest pain or difficulty breathing, an acute attack that lasts for more than two or three days without any pain relief, chronic pain that lasts more than two weeks without relief and back pain that radiates down your leg t
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