1 “... on colorectal cancer held at the University of Leiden, 6-9 June, 1979. I would like to offer grateful thanks...”

2 “... for Postgraduate Medical Education of the Faculty of Medicine, at the University of Leiden and the Department...”

3 “... Committee for postgraduate teaching of the Faculty of Medicine of the University of Leiden. The Workshop...”

4 “... by the Medical Faculty of the University of Leiden in the Boerhaave Quarter, in which most of its clinics...”

5 “... by the Boerhaave Committee for post-graduate medical education of the medical faculty of the University of Leiden...”