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Indiran, V., Prabakaran, N. & Kannan, K. “Hole sign” of the gallbladder. Indian J Gastroenterol 36, 66–67 (2017). https://doi.org/10.1007/s12664-016-0723-3
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DOI: https://doi.org/10.1007/s12664-016-0723-3