Oct. - Nov. 1966, June - July 1967, 1973, 1974
J.M. Rayner
J.McG. Bruckshaw
A.G. Obermuller
K.O. Emery
W. Bullerwell
L.C. Noakes
J.A. Reinemund
J.A. Katili
Dr. E. Oele
The Netherlands
C.R. Jones
R. Sinding-Larsen
Dr. Anthony Reedman
United Kingdom
Dr. Henk J.W.G. Schalke
Naz Ahmed Shaikh
Ole W. Christensen
Dr. David B. Prior
United States of America
Dr. Jos de Sonneville
Ms. Franca Schwarz
Germany
Mr. Ioannis Abatzis
Denmark
