Letter: Spasm and operative cholangiography.
D014670:Ampulla of Vater; D002758:Cholangiography / Q000009:adverse effects* / Q000379:methods; D006801:Humans; D007049:Iatrogenic Disease; D011183:Postoperative Complications; D013035:Spasm / Q000209:etiology*; D009803:Sphincter of Oddi