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The use of placebo control in clinical trials: An overview ..:

F N Chukwuneke ; I C Onwuekwe ; O C Ekwueme
http://www.ijmhdev.com/article.asp?issn=2635-3695;year=2009;volume=14;issue=1;spage=90;epage=95;aulast=Chukwuneke;type=0.  , 2009