(IF YES) How long was your last trip outside the United States to work or conduct research?

1 [ ] Less than 7 days (SKIP to C8, page 11)
2 [ ] 7 to 30 days (SKIP to C8, page 11)
3 [ ] 1 to 6 months (SKIP to C8, page 11)
4 [ ] More than 6 months (SKIP to C8, page 11)