RT Journal Article SR Electronic T1 Occipital neuralgia: another benign cause of "thunderclap headache". JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 411 DO 10.1136/jnnp.55.5.411 VO 55 IS 5 A1 A Pascual-Leone A1 A Pascual-Leone Pascual YR 1992 UL http://jnnp.bmj.com/content/55/5/411.1.abstract AB