Funding for this research was provided by:
United States Agency for International Development (497-A-00-10-00008-00)
National Science Foundation (OCE-0349177, OISE-1243541, OISE-0730256)
Received: 17 March 2017
Accepted: 29 January 2018
First Online: 12 February 2018
Compliance with ethical standards
: On behalf of all authors, the corresponding author states that there is no conflict of interest.