1. Applied Environmental Research Laboratories, Department of Chemistry, Vancouver Island University, Nanaimo, BC, Canada
2. Department of Chemistry, University of Victoria, Victoria, BC, Canada
3. LifeLabs Medical Laboratories, Burnaby, BC, Canada
4. Department of Chemistry, Simon Fraser University, Burnaby, BC, Canada
5. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA