About the Authors

Daniel Barthelmes

Contributed equally to this work with: Daniel Barthelmes, Martina M. Bosch

Affiliation Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland

Martina M. Bosch

Contributed equally to this work with: Daniel Barthelmes, Martina M. Bosch

martina.boesch@usz.ch

Affiliation Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland

Tobias M. Merz

Affiliation Department of Intensive Care Medicine, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland

Benno L. Petrig

Affiliation Institut de Recherche en Ophtalmologie, Sion, Switzerland

Frederic Truffer

Affiliation Institut de Recherche en Ophtalmologie, Sion, Switzerland

Konrad E. Bloch

Affiliations Pulmonary Division, University Hospital Zurich, Zurich, Switzerland, Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

Timothy A. Holmes

Affiliation Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland

Philippe Cattin

Affiliation Medical Image Analysis Center (MIAC), University of Basel Faculty of Medicine, Basel, Switzerland

Urs Hefti

Affiliation Department of Surgery, State Hospital Liestal, Liestal, Switzerland

Miriam Sellner

Affiliation Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland

Florian K. P. Sutter

Affiliation Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland

Marco Maggiorini

Affiliation Medical Intensive Care Unit, University Hospital Zurich, Zurich, Switzerland

Klara Landau

Affiliation Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland

Competing Interests

There were no financial interests or any consultancy, patents, products in development or marketed products in conjunction with the different grants received that were relevant to the study. The company Pfizer granted a certain amount of funding to the entire expedition for logistics including transport of medical devices and personal belongings of both researchers as well as participants, which was all unconditional. None of the researchers can financially profit from the data published. Thus this does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: DB MMB BLP MM KL. Performed the experiments: DB MMB FT TAH. Analyzed the data: DB MMB TMM BLP FT KEB TAH PC UH MS FKS MM KL. Contributed reagents/materials/analysis tools: DB MMB TMM BLP FT KEB PC UH FKS MM KL. Wrote the paper: DB MMB MM KL. Substantial contributions to analysis and interpretation of data: TMM KEB TAH MS FKPS. Drafting the article or revising it critically for important intellectual content: TMM KEB TAH MS FKPS. Final approval of the version to be published: TMM BLP FT KEB TAH PC UH MS FKPS.