Adult 1 Comorbidity 1 Female 1 Humans 1 Implosive Therapy 1 Male 1 Order of onset PTSD/SUD comorbidity 1 Prolonged exposure 1 Relapse prevention 1 Stress Disorders, Post-Traumatic 1 Substance-Related Disorders 1 Time Factors 1 Treatment Outcome 1 Veterans 1 adult 1 comorbidity 1 complication 1 controlled study 1 drug dependence 1 female 1 human 1 implosive therapy 1 male 1 posttraumatic stress disorder 1 randomized controlled trial 1 time factor 1 treatment outcome 1 veteran 1