USAID:10.1136/bmj.323.7305.139
USAID:10.1136/bmj.328.7444.891
USAID:10.1136/bmj.332.7541.605
USAID:10.1136/bmj.d7023
USAID:10.1136/bmj.e981
USAID:10.1136/jamia.2010.005520
USAID:10.1136/jme.29.1.22
USAID:10.1136/sextrans-2011-050114
USAID:10.1136/sextrans-2013-051184.0829
USAID:10.1136/sti.2010.045633