What are key performance indicators that improve survival and portend a more favorable prognosis in children with severe traumatic brain injury? a. Initiation of total parentral nutrition (TPN) b. Avoidance of hypercarbia (PaC02 > 45 mmHg) c. Adequate cerebral perfusion (CPP > 40 mmHg) for 72 hours after severe d. TBI Induced hypocarbia, PaCo2< 30 mmHg All of the statements are correct