About the Authors
Department of Anesthesiology and Critical Care Medicine, University Medical Center Freiburg im Breisgau, Germany
University Eye Hospital, University Medical Center, Freiburg, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: NS JB UG. Performed the experiments: NS MF CS CvO. Analyzed the data: NS JB UG. Contributed reagents/materials/analysis tools: TL HB WL. Wrote the paper: NS TL UG.