Developing a geographic search filter to identify randomised controlled trials in Africa: finding the optimal balance between sensitivity and precision

2011 ◽  
Vol 28 (3) ◽  
pp. 210-215 ◽  
Author(s):  
Elizabeth Pienaar ◽  
Liesl Grobler ◽  
Karishma Busgeeth ◽  
Anne Eisinga ◽  
Nandi Siegfried
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