The effect of secular trends and specialist neurocritical care on mortality for patients with intracerebral haemorrhage, myasthenia gravis and Guillain-Barré syndrome admitted to critical care : an analysis of the Intensive Care National Audit & Research - Damian, MS; Ben-Shlomo, Y; Howard, R; Bellotti, T; Harrison, D; Griggs, K; Rowan, K (Intensive Care Med, 2013)