TY - JOUR A1 - Duncan, D.T. A1 - Aldstadt, J. A1 - Whalen, J. A1 - Melly, S.J. A1 - Gortmaker, S.L. T1 - Validation of Walk ScoreĀ® for Estimating Neighborhood Walkability: An Analysis of Four US Metropolitan Areas Y1 - 2011 DO - 10.3390/ijerph8114160 JF - International Journal of Environmental Research and Public Health VL - 8 IS - 11 SP - 4160 EP - -4179 ER -