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Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsSallie A. MarstonDr. Marston is a professor of geography at the University of Arizona, Tucson, Arizona 85721; marston@email.arizona.edu.Sarah De leeuwDr. de Leeuw is an assistant professor in the Northern Medical Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, and a member of the Faculty of Medicine at the University of British Columbia, Vancouver, British Columbia V6T 1Z4 deleeuws@unbc.ca.
Marston et al. (Mon,) studied this question.
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