- 1956[subject unknown]Independent
- 1957[subject unknown]Independent
- 1958[subject unknown]Independent
- 1959[subject unknown]Independent
- 1960[subject unknown]Independent
- 1961[subject unknown]Independent
- 1963[subject unknown]Independent
- 1964[subject unknown]Independent
- 1965[subject unknown]Independent
- 1966[subject unknown]Independent
- 1967[subject unknown]Independent
- 1968[subject unknown]Independent
- 1970[subject unknown]Independent
- 1972[subject unknown]Independent
- 1973[subject unknown]Independent
- 1974[subject unknown]Independent
- 1976[subject unknown]Independent Investigators
- 1981[subject unknown]Independent
- 1984[subject unknown]Independent
- 1985[subject unknown]Independent
- 1986[subject unknown]Independent
- 1987[subject unknown]Independent
- 1988[subject unknown]Principal Investigators
- 1989[subject unknown]Independent