Zonneveld, Frans W. http://orcid.org/0000-0002-4088-1725
Article History
Received: 12 November 2019
Accepted: 6 February 2020
First Online: 3 March 2020
Ethics approval and consent to participate
: Not applicable
: Consent for publication was obtained from the science curator of Teylers Museum, Mrs. T. van der Spek
: The author declares no competing interest.