1 Erratum to: Drug Saf DOI 10.1007/s40264-014-0155-x

An error was subsequently identified in the article, and the following correction should be noted:

Abstract, paragraph 4, lines 3–4: The following sentence, which previously read:

“Automated, dictionary-based symptom classification had 72 % recall and 86 % precision.”

Should read:

“Automated, dictionary-based symptom classification had 86 % recall and 72 % precision.”