<qa>  What is the name of the study that will take place in the participating centers?MATHERIALS AND METHODS The study will take place in ICUs of the participating centers. Written formal informed consent will be request before the inclusion of each patient in the study; if it wont be possible because of particular neurologic conditions of the patient, an informing module will be provided to the patients family and the informed consent will be request to the patients as soon as possible. 