NOTE: The published material is intended to provide the registered doctor to the Nautilus WEB portal with quick access to information from the current literature, recommendations / suggestions of the major Guidelines, the knowledge currently shared by the scientific community and the experience of doctors who practice discipline in our country, in accordance with the state of knowledge at the time of preparation of the texts and can not therefore be guaranteed their accuracy and completeness. The information given should in no way replace an appropriate clinical judgment in the individual patient, who may also completely ignore the information reported and therefore can not be held responsible for the results of decisions taken on their basis. The Editorial Staff takes no responsibility for any inaccuracies or errors in the original scientific texts or in the published text. Finally, it is recalled that the reading of the texts reported is reserved exclusively for the public of the surgeon doctors formally registered at the Nautilus WEB portal.