Nonpositional Headache Caused by Spontaneous Intracranial HypotensionNeurol 51:1768-1769, Schiewink,W.I.&Smith,K.A., 1998
Primary Intracranial Hypotension & Bilateral Isodense Subdural HematomasNeurol 31:334-337, Sipe,J.C.,et al, 1981