1. Northern Research Station, Forest Service, US Department of Agriculture, Philadelphia, PA, USA
2. Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY, USA
3. Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
4. New Orleans City Council; Fight the Blight Lot Maintenance, City of New Orleans, New Orleans, LA, USA
5. City of New Orleans, New Orleans, LA, USA
6. School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA, USA