1VA Palo Alto Healthcare System, Stanford University, Palo Alto, CA USA
2VA Boston Healthcare System, Boston, USA
3Stanford University, Palo Alto, CA USA
4VA Boston Healthcare System, Harvard Medical School, Boston, USA
5VA Boston Healthcare System, Boston University School of Medicine, Boston, USA
6Durham VA Healthcare System, Duke University, Durham, NC USA
7VA Boston Healthcare System, Dana-Farber Cancer Institute, Harvard Medical School, Boston, USA
8Massachusetts Veterans Epidemiology Research and Information Center, 150 S Huntington Ave, Boston, MA 02141 USA
9Present Address: Indian Institute of Technology Roorkee, Roorkee, India
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