Correspondence to: Professor F Baum, Department of Public Health, Flinders University, GPO Box 2100, Adelaide 5001; fran.baum@ flinders.edu.au . . . . . . . . . . . . . . . . . . . . . . . P articipatory action research (PAR) differs from most other approaches to public health research because it is based on reflection, data collection, and action that aims to improve health and reduce health i...