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Mayo Clinic
Chinese Academy of Medical Sciences & Peking Union Medical College
Endoscopy | November 6, 2015 | Volume: 48 | Issue: 04 | Pages: 330-338
10.1055/s-0034-1393358
Endoscopy | February 10, 2015 | Volume: 47 | Issue: 05 | Pages: 398-408
10.1055/s-0034-1391285