Mark Wefers Bettink

Monitoring of mitochondrial oxygen tension in the operating theatre 8 163 Declarations Consent for publication Not applicable. Availability of data and materials The datasets used and analysed during the current study are available from the corresponding author on reasonable request. Competing interests Dr. Mik is founder and shareholder of PhotonicsHealthcareB.V., Utrecht, TheNetherlands. Photonics Healthcare B.V. holds the exclusive licenses to several patents related to mitochondrial oxygen measurements, filed and owned by the Academic Medical Center in Amsterdam and the Erasmus Medical Center in Rotterdam, The Netherlands. Photonics Healthcare B.V. is the developer and manufacturer of the COMET ® device. The remaining authors declare no competing interests. Funding Not applicable. Authors contributions FH: study design, inclusion of patients, measurements, data processing, writing article. LS: inclusion of patients, measurements, data processing, writing article. MWB: inclusion of patients, measurements, data processing. LR: study design, inclusion of patients, measurements, data processing. RJ: study design, inclusion of patients. RJS: Head of the department, editing of manuscript. EM: study design, head of research team, editing of manuscript. All authors read and approved the final manuscript.