1. Department of Surgery; Maastricht University Medical Centre; Maastricht The Netherlands
2. NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; Maastricht The Netherlands
3. Department of Intensive Care Medicine; Maastricht University Medical Centre; Maastricht The Netherlands
4. Department of Surgery; Royal Infirmary of Edinburgh; Edinburgh UK
5. Stable Isotope Biochemistry Laboratory; Scottish Universities Environmental Research Centre; East Kilbride Glasgow UK