Why is conducting research in some countries so difficult?

(Columbia University's Mailman School of Public Health) Low- and middle-income countries such as Brazil face a lack of epidemiological data, and one of the key priorities for researchers is developing high-quality surveys. Investigators at Columbia University's Mailman School of Public Health with collaborators at the Federal University of São Paulo studied the difficulties in conducting a longitudinal epidemiological survey in a school-based sample in Brazil.

from EurekAlert! - Social and Behavioral Science http://ift.tt/2wsvvay