Correction to: How effective and safe is medical cannabis as a treatment of mental disorders? A systematic review.

The article "How effective and safe is medical cannabis as a treatment of mental disorders? A systematic review", written by Eva Hoch, was originally published Online First without open access. After publication in volume 269, issue 1, page 87-105 the author decided to opt for Open Choice and to make the article an Open Access publication. Therefore, the copyright of the article has been changed to © The Author(s) 2019 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.