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doi:10.1136/bmj.311.7014.1228a

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Jacoline E C Bromberg,
Gabriel J E Rinkel,
Ale Algra,
Jan Van Gijn

Neurologist Consultant neurologist Epidemiologist Professor of neurology University Department of Neurology, PO Box 85500, 3508 GA Utrecht, Netherlands

EDITOR,--Jeremy Rowe and colleagues are under the impression that subarachnoid haemorrhage in the relatives of our patients was diagnosed on the basis of a telephone interview alone, but, as we wrote, all diagnoses were verified by a review of medical documents. Furthermore, Rowe and colleagues are not surprised at the increased risk of subarachnoid haemorrhage in first degree relatives since most neurosurgeons have encountered families with clustering of such haemorrhages. We found, however, that the increased risk in first degree relatives applies to the average …