1. Department
of Environmental Health Sciences, Norman J. Arnold School of Public
Health, University of South Carolina, Columbia, South Carolina 29208, United States
2. Nickel
Producers
Environmental Research Association (NiPERA), 2525 Meridian Parkway, Suite 240, Durham, North Carolina 27713, United States
3. Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States