DOI: 10.1055/s-00000012

Endoscopy

References

Verma D, Gostout CJ, Petersen BT. et al.
Establishing a true assessment of endoscopic competence in ERCP during training and beyond: a single-operator learning curve for deep biliary cannulation in patients with native papillary anatomy. 
Gastrointest Endosc 2007; 65: 394-400  

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