Erratum to: Ann Gen Psychiatry (2017) 16:14 DOI 10.1186/s12991-017-0138-2

The original article [1] has been updated to include the correct version of Table 1. The article originally published online showed an incomplete version of the table. The correct version of Table 1 is shown in this erratum. This error was carried forward by the production team and was not the fault of any authors.

Table 1 Characteristics of included studies