Jan Roorda, a prominent general practitioner from Haarlem, was the founder of Medisch Cerzet. He wrote down his experiences in Kamp Amersfoort. From his diary: “I looked curiously back at the barracks and the men who walked around them. Bum-like soldiers in clogs in old uniforms with cropped heads and with pale faces. So they walked around there in great numbers. “Nicht anlehnen” (free translated: “don’t lean like that”), I am suddenly bellowed at me, and then suddenly I realized the great change my condition had undergone. Then I realized that I was in the midst of enemies and that I had to adjust my attitude accordingly. “