Sayers, Ken
Menzel, Charles R.
Funding for this research was provided by:
Leakey Foundation
National Institutes of Health (1F32HD061177)
National Institutes of Health (HD056352)
National Institutes of Health (HD060563)
Article History
Received: 8 February 2016
Revised: 13 November 2016
Accepted: 15 November 2016
First Online: 20 December 2016
Compliance with ethical standards
: All methods were approved by the Institutional Animal Care and Use Committee (IACUC) of Georgia State University. Participation was voluntary on the part of the chimpanzees.