Phosphocreatine recovery time constant (PCr) at peak exercise as a potential endpoint for clinical trials in PAD. Issue 1 (December 2016) - Gonzalez, Jorge; Li, Yan; Shaw, Peter; Balfour, Pelbreton; Yang, Yang; Kay, Jennifer; DiMaria, Joseph; Weltman, Arthur; Salerno, Michael; Meyer, Craig; Epstein, Frederick; Kramer, Christopher