This study will be conducted in accordance with good clinical practice. Being purely observational, it should not lead to any particular ethical problem. Treatment will not be altered unless the patient agrees to participate in the study. The free and informed consent will probably be difficult to obtain at the arrival of the patient if it has a severe neurological impairment with often an altered capacity of discernment and in this case the relatives will be asked to consent. As soon as possible the patient himself will be informed and his free consent obtained. If it is a minor patient the informed consent will be asked to their parents. All data collected will be anonymized.