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2. Volvulus of the gallbladder;Stieber;Am J Gastroenterol,1983
3. Acute and recurrent torsion of the gallbladder;Ashby;Br J Surg,1965
4. Congenital anomalies of the gallbladder, review of 148 cases with report of double gallbladder;Gross;Arch Surg,1936
5. Differential diagnosis in diseases of the gallbladder and ducts;Brewer;Ann Surg,1899