Petticrew Mark, Tugwell Peter, Welch Vivian, Ueffing Erin, Kristjansson Elizabeth, Armstrong Rebecca, Doyle Jodie, Waters Elizabeth
Public and Environmental Health Research Unit, Department of Public Health and Policy, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK.
J Public Health (Oxf). 2009 Sep;31(3):453-6. doi: 10.1093/pubmed/fdp076. Epub 2009 Jul 28.