| COBT | chronic obstruction of the biliary tract |
|---|---|
| CAO | chronic airway obstruction; coronary artery obstruction |
| SAO | small airway obstruction; splanchnic artery occlusion; subvalvular aortic obstruction |
| ERBD | Endoscopic Retrograde Bile(Biliary) Drainage |
| HBUS | Hepato-Biliary Ultra-Sound |