@article{ref1,
title="International health in the 21st century: trends and challenges",
journal="Social science and medicine (1982)",
year="2002",
author="Zwi, Anthony B. and Yach, Derek",
volume="54",
number="11",
pages="1615-1620",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0277-9536",
doi="",
url="http://dx.doi.org/"
}