Stakeholders’ views and experiences of developing guidance for, designing, commissioning and implementing changes to the external physical environment which have the potential to promote active living: A systematic review and qualitative synthesis. Authors: Emma R. Lawlor1, Kate Ellis1, Jean Adams1, Louise Foley1, Russ Jago2, Tessa Pollard3, Stephanie Morris3, Carolyn Summerbell3, Steven Cummins4, Jenna Panter1 1. Centre for Diet and Activity Research (CEDAR), MRC Epidemiology Unit, University of Cambridge, School of Clinical Medicine, Cambridge, UK 2. Centre for Exercise, Nutrition and Health Sciences, School for Policy Studies, University of Bristol, Bristol, UK 3. Department of Anthropology and Wolfson Research Institute for Health and Wellbeing, Durham University, Durham, UK 4. Population Health Innovation Lab, Department of Public Health, Environments & Society, Faculty of Public Health & Policy, London School of Hygiene & Tropical Medicine, London, UK Contact: Dr. Emma R Lawlor, emma.lawlor@mrc-epid.cam.ac.uk