The Cochrane Column

“The Cochrane Column” was started from the January 2007 issue with enthusiasm and active collaboration of Dr. Mona Nasser. “The Cochrane Column” appearing in this issue has been prepared from The Cochrane Library 2007, Issue 2 by my colleague Dr. Hadi Razjouyan. He is a research fellow at the “Digestive Disease Research Center” of Shariati Hospital, Tehran University of Medical Sciences. He has a special interest in evidence based medicine. I would like to thank his contribution.