1. OHSU-PSU School of Public Health; Oregon Health & Science University; 3181 SW Sam Jackson Park Road Portland OR 97239 USA
2. Division of Hematology/Oncology; Knight Cancer Institute; Oregon Health & Science University; Portland OR 97239 USA
3. Health Services Research & Development and Section of Pulmonary & Critical Care Medicine; VA Portland Health Care System; Portland OR 97239 USA
4. Department of Medicine and Department of Radiation Medicine; Oregon Health & Science University; Portland OR 97239 USA
5. Linus Pauling Institute; Department of Animal Sciences; Oregon State University; Corvallis OR 97331 USA
6. College of Public Health and Human Sciences; School of Biological and Population Sciences; Oregon State University; Corvallis OR 97331 USA