1. Department of Physiology and Pharmacology; Karolinska Institutet; SE-171 77 Stockholm Sweden
2. Department of Clinical Neuroscience, Clinical Neurophysiology; Karolinska Institutet; SE-171 77 Stockholm Sweden
3. Centre of Human and Aerospace Physiological Sciences; Faculty of Life Sciences and Medicine; King's College London; London SE1 1UL UK
4. Analytical Chemistry; Department of Chemistry - Biomedical Centre and SciLifeLab; Uppsala University; 75124 Uppsala Sweden
5. Japan Synchrotron Radiation Research Institute; SPring-8; Hyogo 679-5198 Japan