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Guyatt, G.H., Pugsley, S.O., Sullivan, M.J., Thompson, P.J., Berman, L., Jones, N.L., Fallen, E.L. and Taylor, D.W. (1984) Effect of Encouragement on Walking Test Performance. Thorax, 93, 812-822.
https://doi.org/10.1136/thx.39.11.818
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