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Acknowledgments The authors appreciate the time and effort expended by all respondents to questionnaires, and all the people who helped to locate the appropriate respondents within 24 state agencies. The authors also thank the reviewers and associate editor for their time and thoughtful critiques. This article was written with support from the Michigan State University Agricultural Experiment Station through state project MICL02031.
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Burroughs et al. (2006) studied this question.
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