1. Department of Occupational and Environmental Health, University of Iowa, Iowa City, Iowa, USA
2. Department of Epidemiology and Environmental Health, State University of New York at Buffalo, Buffalo, New York, USA
3. Community, Environmental, and Occupational Medicine Department, Faculty of Medicine, Menoufia University, Shebin Elkom, Egypt
4. Department of Clinical Pathology, National Liver Institute, Menoufia University, Shebin Elkom, Egypt
5. Department of Pharmacology and Toxicology, State University of New York at Buffalo, Buffalo, New York, USA