- 1989[subject unknown]Other Research Personnel
- 1990[subject unknown]Other Research Personnel
- 1991[subject unknown]Other Research Personnel
- 1991[subject unknown]Corporation Member
- 1992[subject unknown]Corporation Member
- 1993[subject unknown]Corporation Member
- 1994[subject unknown]Corporation Member
- 1995[subject unknown]Corporation Member
- 1996[subject unknown]Corporation Member