a systematic review and meta-analysis of prospective studies
Post-traumatic stress disorder (PTSD) develops according to consensus criteria within the first 1-6 months after a horrifying traumatic event, but it is alleged that PTSD may develop later. The objective was to review the evidence addressing occurrence of PTSD with onset >6 months after a traumatic event (delayed-onset PTSD).
Journal review article
Scandinavian Journal of Work, Environment and Health, 2014, Vol 40, Issue 3, p. 215-229