Muthukrishna, Michael http://orcid.org/0000-0002-7079-5166
Henrich, Joseph http://orcid.org/0000-0002-5012-0065
Article History
Received: 15 March 2018
Accepted: 14 December 2018
First Online: 11 February 2019
Competing interests
: The authors declare no competing interests.