David C. Goodman, MD, MS, is an Associate Professor of Pediatrics and Community Family Medicine at the Dartmouth Medical School, Hanover, New Hampshire. John E. Wennberg, MD, MPH, is the Director of the Center for the Evaluative Clinical Sciences at the Dartmouth Medical School, and is also the Peggy Y. Thomson Professor for the Evaluative Clinical Sciences.
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Goodman et al. (1999) studied this question.