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2. Technique to avoid spinal tap headache;Broker, R.J.;JAMA
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4. Failure of postural manoeuvres to prevent lumbar puncture headache;Hilton-Jones, D.; Harrad, R.A.; Gill, M.W.; Warlow, C.P.;J Neurol Neurosurg Psychiat,1982
5. Lumbar puncture headache: controlled study of the preventative effect of 24 hours bed rest;Carbaat, P.A.J.; van Crevel, H.;Lancet,1981