Validation and refinement of the difficult intravenous access score: a clinical prediction rule for identifying children with difficult intravenous access.
Riker MW, Kennedy C, Winfrey BS, Yen K, Dowd MD. Validation and refinement of the difficult intravenous access score: a clinical prediction rule for identifying children with difficult intravenous access. Acad Emerg Med. 2011 Nov; 18(11):1129-34.