Cerebral Monitoring in the Operating Room and the Intensive Care Unit: An Introductory for the Clinician and a Guide for the Novice Wanting to Open a Window to the Brain -- Cerebral Monitoring in the Operating Room and the Intensive Care Unit — An Introductory for the Clinician and a Guide for the Novice Wanting to Open a Window to the Brain -- Cerebral Monitoring in the Operating Room and th…