Severe Acquired Brain Injuries: Prognostic Factors and Quality of Care

For each unit involved, it will be collected these data : * Structural and organizational data of the Rehabilitation Units for Severe Acquired Brain Injuries; * Detailed information on patients upon entering Rehabilitation Units for Severe Acquired Brain Injuries; * Detailed information on patients, re-evaluated 4 months after the acute event Statistical models will be implemented, in order to identify prognostic factors that could predict the probability to observe three events, which represent objectives of the rehabilitation process: decannulation, trunk control and total feeding by os. These events should be evaluated four months after the acute episode.