The Role of Psychological Flexibility and Inflexibility in Substance Addiction, Abuse, or Misuse: A Systematic Review and Meta-analysis. - Barrado-Moreno, Victoria; Serrano-Ibáñez, Elena R.; Esteve, Rosa; Ramírez-Maestre, Carmen; Sánchez-Meca, Julio (International Journal of Mental Health & Addiction, 2026)