Dr. Widukind Lenz, from the University Children’s Clinic in Hamburg, continued to search for the cause behind the increasing numbers of malformed births in West-Germany. Together with Karl-Hermann Schulte-Hillen, father of a Thalidomide child, Lenz visited affected families all over Northern Germany. He also got in touch with several doctors and hospitals across the country, putting together a list with hundreds of additional cases.
Lenz asked the affected families all kinds of questions. He soon realized one common factor: almost all the mothers remembered they had taken Contergan (Thalidomide) at some point in their early pregnancies. Lenz therefore had reasonable grounds to believe the drug was responsible for those deformities in newborns.

Anklageschrift (indictment) from 1967, today archived at the National Archives of North Rhine-Westphalia in Duisburg, Germany (Rheinland Division, Gerichte Rep. 139, No. 1–396), pp. 405ff.

WDR: Der Mann der Contergan stoppte (The man who stopped Contergan), November 27, 2006.