| http://www.w3.org/ns/prov#value | - Simply, it is characterized by headaches that at some times become disabling, said Robert G. Kaniecki, a neurologist who serves as director of The Headache Center at UPMC. We are dealing with the three 'S's': Severity, Sickness -- nausea or vomiting, Sensitivities, mainly to light or noise.
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