Greiner T, Gold H, Cattell M, Travell J, Bakst H, Rinzler SH, Benjamin ZH, Warshaw LJ, Bobb AL, Kwit NT, Modell W, Rothendler HH, Messeloff CR, Kramer ML (1950). Context

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Methodological context for: Greiner T, Gold H, Cattell M, Travell J, Bakst H, Rinzler SH, Benjamin ZH, Warshaw LJ, Bobb AL, Kwit NT, Modell W, Rothendler HH, Messeloff CR, Kramer ML (1950). A method for the evaluation of the effects of drugs on cardiac pain in patients with angina of effort. Am J Med 9:143-155.

Observer bias: Differences in the way treatment outcomes are assessed

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