The Physical Activity and Redesigned Community Spaces (PARCS) Study: Protocol of a natural experiment to investigate the impact of citywide park redesign and renovation oleh Terry T. K. Huang, Katarzyna E. Wyka, Emily B. Ferris, Jennifer Gardner, Kelly R. Evenson, Devanshi Tripathi, Gabriel Martinez Soto, Matthew S. Cato, Jon Moon, Julia Wagner, Joan M. Dorn, Diane J. Catellier, Lorna E. Thorpe