参考文献
1. Yeh H, Goodman J, Rabinowitz J. Floating Gallstones in Bile Without Added Contrast Material. AJR Am J Roentgenol. 1986;146(1):49-50. doi:10.2214/ajr.146.1.49 - Pubmed
2. Malet P, Baker J, Kahn M, Soloway R. Gallstone Composition in Relation to Buoyancy at Oral Cholecystography. Radiology. 1990;177(1):167-9. doi:10.1148/radiology.177.1.2399314 - Pubmed