PhD Thesis, State University Groningen, The Netherlands, 1988

In 1988, Anton de Groot obtained his PhD title after succesfully defending his Thesis entitled ”Adverse Reactions to Cosmetics” (available here). His promotor was Prof. dr. Johan P. Nater, who had stimulated him to persue a scientific career. De Groot and Nater have worked closely together and wrote many publications, including their first book ”Unwanted Effects of Cosmetics and Drugs used in Dermatology”.

Prof. dr. Johan P. Nater adresses the ”young doctor”, who just received his ”Bulla promotionis”