Normobaric hyperoxia for treatment of pneumocephalus after posterior fossa surgery in the semisitting position: a prospective randomized controlled trial. oleh Bujung Hong, Frank Biertz, Peter Raab, Dirk Scheinichen, Philipp Ertl, Anika Grosshennig, Makoto Nakamura, Elvis J Hermann, Josef M Lang, Heinrich Lanfermann, Joachim K Krauss