1. 1Department of Geological Sciences, California State University, Fullerton, California, U.S.A.
2. 2Public Health, University of California, Irvine, Irvine, California, U.S.A.
3. 3School of Earth and Space Exploration, Arizona State University, Tempe, Arizona, U.S.A.
4. 4Department of Geoscience, University of Nevada, Las Vegas, Nevada, U.S.A.
5. 5Department of Geography, University of Sheffield, Sheffield, United Kingdom