The relation of optic nerve sheath diameter (ONSD) and intracranial pressure (ICP) in pediatric neurosurgery practice - Part II: influence of wakefulness, method of ICP measurement, intra-individual ONSD-ICP correlation and changes after therapy - Kerscher, S R; Schöni, D; Neunhoeffer, F (Childs Nerv Syst, 2020)