Saeid , M., Taher, M., Vahedi , H. ., & Hosseinkhanzadeh , A. A. . (2026). Structural Modeling of Functional Disability Severity Based on Health-Promoting Lifestyle and Distress Tolerance: The Mediating Role of Ego Strength in Patients with Functional Gastrointestinal Disorders. Health Nexus, 4(2), 1-15. https://www.journals.kmanpub.com/index.php/Health-Nexus/article/view/5948