- Correspondence to Professor Paolo Boffetta Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1079, New York, NY 10029, USA; ; Professor Reza Malekzadeh, Digestive Disease Research Center, Tehran University of Medical Sciences, Shariati Hospital, Kargar Shomali Avenue, Tehran 14117, Iran;
- Received August 8, 2012
- Revised October 31, 2012
- Accepted November 6, 2012
- First published December 20, 2012.
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