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Dr Backer is an emergency and sports medicine physician for Kaiser Permanente in Northern California. He is a past president of the Wilderness Medical Society and has published extensively in the areas of travel medicine and field water sanitation. Dr Backer is currently in a preventive medicine residency at the University of California at San Francisco, where he has just earned his master of public health degree. He is also a Wilderness First Aid Book editor for the National Safety Council.
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Butler et al. (1998) studied this question.
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