On 2013 Oct 21, Hilda Bastian commented:

The predominant weight for safety concerns about single-session debriefing in this systematic review are carried by a single trial, at high risk of bias. See discussion in my comment here: Bisson JI, 1997. The method of imputation of adverse events in this trial does not appear to be described in this review.

A critical quality assessment of that trial was in part made by a systematic review author who was also an author of the trial. A more recent systematic review conducted by others (Gartlehner G, 2013), found the evidence on this intervention to be generally weak. There is further discussion in this blog post.

On 2013 Oct 21, Hilda Bastian commented:

The predominant weight for safety concerns about single-session debriefing in this systematic review are carried by a single trial, at high risk of bias. See discussion in my comment here: Bisson JI, 1997. The method of imputation of adverse events in this trial does not appear to be described in this review.

A critical quality assessment of that trial was in part made by a systematic review author who was also an author of the trial. A more recent systematic review conducted by others (Gartlehner G, 2013), found the evidence on this intervention to be generally weak. There is further discussion in this blog post.