Sentinel Headache: A Warning Sign Preceding Every Fourth Aneurysmal Subarachnoid Hemorrhage
H. Joswig, J.Y. Fournier, G. Hildebrandt Department of Neurosurgery Cantonal Hospital St. Gallen St. Gallen, Switzerland M.N. Stienen Department of Neurosurgery Cantonal Hospital St. Gallen St. Gallen, Switzerland Department of Neurosurgery Hôpitaux Universitaires de Genève Geneva, Switzerland With great interest,
