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Four-Step Classification: classification based on the steps of ETGBD. The ETGBD procedure is classified according to the steps at which failure can occur, as follows; step 0, step 1, step 2, step 3a, step 3b, and step 4.
ETGBD, endoscopic transpapillary gallbladder drainage; CD, cystic duct; GW, guidewire; GB, gallbladder.
