Erratum to: Eur Child Adolesc Psychiatry DOI 10.1007/s00787-012-0292-7

In the original publication, the scoring method of the Negative outcome expectancy for ketamine is incorrectly described. The correct version is as follows:

“The response categories included: 1, very severe damage; 2, severe damage; 3, a little damage; and 4, no damage.”