1 Centre for Sustainable Healthcare Education, Faculty of Medicine, University of Oslo, 0318 Oslo, Norway. Electronic address: eivind.engebretsen@medisin.uio.no.
2 Centre for Sustainable Healthcare Education, Faculty of Medicine, University of Oslo, 0318 Oslo, Norway.
3 Centre for Sustainable Healthcare Education, Faculty of Medicine, University of Oslo, 0318 Oslo, Norway; Karolinska Institutet, Stockholm, Sweden.
4 The Helen Clark Foundation, Auckland, New Zealand.
5 Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK.