International Subarachnoid Aneurysm Trial (ISAT) of neurosurgical clipping versus endovascular coiling in 2143 patients with ruptured intracranial aneurysms: a randomised trial. - Molyneux,A.; Kerr,R.; Stratton,I.; Sandercock,P.; Clarke,M.; Shrimpton,J.; Holman,R. (Lancet, 2002)