SOUMERAI, STEPHEN B.; McLAUGHLIN, THOMAS J.; GURWITZ, JERRY H.; GUADAGNOLI, EDWARD; HAUPTMAN, PAUL J.; BORBAS, CATHERINE; MORRIS, NORA; McLAUGHLIN, BARBARA; GAO, XIAOMING; WILLISON, DONALD J.; ASINGER, RICHARD; GOBEL, FREDARICK Author Information
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Soumerai et al. (1999) studied this question.