LI Therapy will be delivered in two recruiting centers by experienced LI Therapy trained psychologists or psychiatrists (a minimum level three of training is required) The intervention will consist in delivering 15 "Basic" Protocol therapy sessions targeting symptoms of complex PTSD The study contains one single arm. One extra-session called PTSD protocol could be optionally delivered if the patient had a very recent trauma that could exacerbate his PTSD symptoms. This session is delivered in the beginning of the research protocol.

same as above

International Trauma Questionnaire measures subscores of simple and complex PTSD, the score is calculated using an algorithm, a minimum score of 8 for the PTSD simple part and of 8 for PTSD complex part is needed in order to diagnose a complex PTSD; the maximum score for simple PTSD is 16, same for complex PTSD.

the DERS scale (Gratz and Roemer, 2004) contains 36 Likert Scale questions with scores from 1 to 5; the scale can generate a total score and six underscores (assessing nonacceptance, goals, impulse, awareness, strategies, clarity); in a general population cohort the mean score was of 77.99 (SD= 20.72) for N=260 women and 80.66 (SD= 18.79) for N=97 men

RSES is one of the most widely used measures of global self esteem; it contains 10 questions with answers ranging from 0 (poor) to 3 (excellent); five questions are positively worded and five questions are negatively worded. Sinclair and colleagues, 2010 reported a mean score of 22.62 (SD=5.80) in a general population cohort from the US of N=503 individuals