Superior Sagittal SinusCerebral VeinsCerebrovascular CirculationCerebral ArteriesCerebral InfarctionCerebral PalsyMiddle Cerebral ArteryVeinsBrainCerebral AngiographyInfarction, Middle Cerebral ArteryMalaria, CerebralBrain IschemiaCerebral HemorrhageBlood Flow VelocityOxygenCarbon DioxideBlood Specimen CollectionRegional Blood FlowBlood Gas Analysis