to y ield a nsk order ' and thus a behaviorally tional Institutes of Health Training Grant GM-derived risk order would be obtained. Risk-01231-13. This paper has benefited from discussions taking behavior and many questions of theowith David Krantz.retical interest pertaining to the nature of Requests for reprints should be sent to Clyde H. 1 1 -1 -1 i j j Coombs, 580 Union Drive, Ann Arbor, Michigan psychological risk are then opened to study 48109.in a well-controlled way.

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