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Correspondence: Qiang Cai Division of Digestive Diseases, 1365 Clifton road, Suite B1262, Emory University, School of Medicine, Atlanta, GA 30322, USA Tel +1 404 727 5638 Fax +1 404 727 5767 Email qcai@emory.edu
The authors declare no conflicts of interest.
© 2010 Mathews et al, publisher and licensee Dove Medical Press Ltd. This is an Open Access article which permits unrestricted noncommercial use, provided the original work is properly cited.