Jakob Burcharth1, Hans-Christian Pommergaard2, Jacob Rosenberg2. 1. Centre for Perioperative Optimization, Department of Surgery, Herlev Hospital, University of Copenhagen, Herlev, Denmark. Electronic address: jakobburcharth@gmail.com. 2. Centre for Perioperative Optimization, Department of Surgery, Herlev Hospital, University of Copenhagen, Herlev, Denmark.