1. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105
2. Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, Washington 98109
3. Chongqing Blood Center, Chongqing 400015, P.R. China
4. Department of Chemistry, Jilin University, Changchun, Jilin Province 130061, P.R. China
5. Arizona Metabolomics Laboratory, Center for Metabolic and Vascular Biology, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona 85004