AMA Manual of Style
by If there are six authors/editors or less, include the names of all authors/editors.
If there are more than six authors/editors, include the first three names, then shorten with et al.
1. Hallal AH, Amortegui JD, Jeroukhimov IM, et al. Magnetic resonance cholangiopancreatography accurately detects common bile duct stones in resolving gallstone pancreatitis. J Am Coll Surg. 2005;200(6):869-75.
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