Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)

Breath Research Institute of University of Innsbruck, Dornbirn, Austria (M.K., M.N., A.A.); Department of Anesthesiology and Critical Care Medicine (M.K., M.N., A.A.), Institute of Legal Medicine and Core Facility Metabolomics (H.O., S.H., B.B.), and University Clinic for Internal Medicine III (Cardiology) (H.A.), Innsbruck Medical University, Innsbruck, Austria; Department of Cardiology, Rehabilitation Centre Münster in Tyrol, Münster, Austria (H.A.); and Cambridge Isotopes Laboratories, Tewksbury, Massachusetts (A.M.)