Author Affiliations +
K. Darwin Murrell,1 Larry Ash,2 Phil Coyne3
1Centre for Experimental Parasitology, Faculty of Life Sciences, University of Copenhagen, 1870 Fredericksberg, Denmark
2Department of Epidemiology, UCLA, Los Angeles, California 90095
3Department of Preventive Medicine and Biometrics, USUHS School of Medicine, Bethesda, Maryland 20814