Prediction of 60 day case-fatality after aneurysmal subarachnoid haemorrhage: results from the International Subarachnoid Aneurysm Trial (ISAT). by Risselada, R, Lingsma, H, Bauer-Mehren, A, Friedrich, C, Molyneux, A, Kerr, R, Yarnold, J, Sneade, M, Steyerberg, E, Sturkenboom, M