1. [1] Alotaibi A. Combating anxiety and depression among school children and adolescents through student counselling in Saudi Arabia. Procedia Soc Behav Sci 2015; 205: 18-29. [DOI:10.1016/j.sbspro.2015.09.006]

2. [2] Polanczyk GV, Salum GA, Sugaya LS, Caye A, Rohde LA. Annual research review: A meta-analysis of the worldwide prevalence of mental disorders in children and adolescents. J Child Psychol Psychiatry 2015; 56: 345-365. [DOI:10.1111/jcpp.12381] [PMID]

3. [3] Charlson F, Van Ommeren M, Flaxman A, Cornett J, Whiteford H, Saxena S. New WHO prevalence estimates of mental disorders in conflict settings: A systematic review and meta-analysis. Lancet 2019; 394: 240-248. [DOI:10.1016/S0140-6736(19)30934-1]

4. [4] American Psychiatric Association. Diagnostic and statistical manual of mental disorders: DSM-5 (5th ed.). Translated to persian by: Avadisyance H, Hashemi Minabad H, Arab Ghahestani D. Tehtan: Roshd. 2015.

5. [5] Mohammadi MR, Pourdehghan P, Mostafavi SA, Hooshyari Z, Ahmadi N, Khaleghi A. Generalized anxiety disorder: Prevalence, predictors, and comorbidity in children and adolescents. J Anxiety Disord 2020; 34: 1-8. [DOI:10.1016/j.janxdis.2020.102234] [PMID]

6. [6] Costello EJ, Egger H, Angold A. 10-year research update review: The epidemiology of child and adolescent psychiatric disorders: I. Methods and public health burden. J Am Acad Child Adolesc Psychiatry 2005; 44: 972-986. [DOI:10.1097/01.chi.0000172552.41596.6f] [PMID]

7. [7] Sadock NJ, Sadock VA, Ruiz P. Kaplan and Sadock,s synopsis of psychiatry: behavioral sciences/clinical psychiatry (11th ed.). Translated by Farzin Rezaei. Tehran: Arjmand. 2015.

8. [8] Kovacs M, Feinberg T, Crouse-Novak M, Paulauskas S, Filkenstein R. Depressive disorders in childhood: I. A longitudinal perspective study of characteristics and recovery. Arch Gen Psychiatr 1984; 41: 229-237. [DOI:10.1001/archpsyc.1984.01790140019002] [PMID]

9. [9] Garber J, Weersing VR. Comorbidity of anxiety and depression in youth: Implications for treatment and prevention. Clin Psychol Sci Pract 2010; 17: 293-306. [DOI:10.1111/j.1468-2850.2010.01221.x] [PMID] [PMCID]

10. [10] Al-Asadi AM, Klein B, Meyer D. Multiple comorbidities of 21 psychological disorders and relationships with psychosocial variables: A study of the online assessment and diagnostic system within a web-based population. J Med Internet Res 2015; 17: e55. [DOI:10.2196/jmir.4143] [PMID] [PMCID]

11. [11] Wittchen HU. Generalized anxiety disorder: Prevalence, burden, and cost to society. Depress Anxiety 2002; 16: 162-171. [DOI:10.1002/da.10065] [PMID]

12. [12] Olfson M, Gameroff MJ. Generalized anxiety disorder, somatic pain and health care costs. Gen Hosp Psychiatr 2007; 29: 310-316. [DOI:10.1016/j.genhosppsych.2007.04.004] [PMID]

13. [13] Turk CL, Heimberg RG, Luterek JA, Mennin DS, Fresco DM. Delineating emotion regulation deficits in generalized anxiety disorder: A comparison with social anxiety disorder. Cognit Ther Res 2005; 29: 89-106. [DOI:10.1007/s10608-005-1651-1]

14. [14] Copeland WE, Shanahan L, Erkanli A, Costello EJ, Angold A. Indirect comorbidity in childhood and adolescence. Front Psychiatr 2013; 4: 1-8. [DOI:10.3389/fpsyt.2013.00144] [PMID] [PMCID]

15. [15] Melegari MG, Bruni O, Sacco R, Barni D, Sette S, Donfrancesco R. Comorbidity of attention deficit hyperactivity disorder and generalized anxiety disorder in children and adolescents. Psychiatr Res 2018; 270: 780-785. [DOI:10.1016/j.psychres.2018.10.078] [PMID]

16. [16] Heller W, Nitschke JB. The puzzle of regional brain activity in depression and anxiety: The importance of subtypes and comorbidity. Cogn Emot 1998; 12: 421-447. [DOI:10.1080/026999398379664]

17. [17] Fichter MM, Quadflieg NN, Fischer UC, Kohlboeck GG. Twenty-fiveyear course and outcome in anxiety and depression in the upper bavarian longitudinal community study. Acta Psychiatr Scand 2010; 122: 75-85. [DOI:10.1111/j.1600-0447.2009.01512.x] [PMID]

18. [18] Garber J, Weersing VR. Comorbidity of anxiety and depression in youth: implications for treatment and prevention. Clin Psychol (New York) 2010; 17: 293-306. [DOI:10.1111/j.1468-2850.2010.01221.x] [PMID] [PMCID]

19. [19] Behzadpour S, Pouretemad HR, Akbari Zardkhaneh S. Conceptualization of comorbid anxiety in autism spectrum disorder: An integrative literature review. Koomesh 2021; 23: 11-19. (Persian). [DOI:10.29252/koomesh.23.1.11]

20. [20] Kovacs M, Beck AT. An empirical-clinical approach toward a definition of childhood depression. In Schulterbrandt JG, Raskin A. (eds). Depression in childhood: Diagnosis, treatment, and conceptual models. New York: Raven Press 1977; 1-25.

21. [21] Smukher MR, Craighead WE, Craighead LW, Green BJ. Normative and reliability data for the Children's Depression Inventory. J Abnorm Child Psychol 1986; 14: 25-39. [DOI:10.1007/BF00917219] [PMID]

22. [22] Kovacs M. Children's depression inventory: Manual. Toronto, ON: Multi-Health Systems. 1992.

23. [23] Dehshiri GR, Najafi M, Shikhi M, Habibi Askarabad M. Investigating primary psychometric properties of Children's Depression Inventory (CDI). J Fam Res 2009; 5: 159-177. (Persian).

24. [24] Spitzer RL, Kroenke K, Williams JBW, Lo¨we B. A brief measure for assessing generalized anxiety disorder. Arch Intern Med 2006; 166: 1092-1097. [DOI:10.1001/archinte.166.10.1092] [PMID]

25. [25] Naeinian MR, Shaeiri MR, Sharif M, Hadian M. To study reliability and validity for a brief measure for assessing generalized anxiety disorder (GAD-7). Clin Psychol Pers 2011; 3: 41-50. (Persian).

26. [26] Kim-Cohen J, Caspi A, Moffitt TE, Harrington H, Milne BJ, Poulton R. Prior juvenile diagnoses in adults with mental disorder: Developmental follow-back of a prospective-longitudinal cohort. Arch Gen Psychiatr 2003; 60: 709-717. [DOI:10.1001/archpsyc.60.7.709] [PMID]

27. [27] Gazelle H, Ladd GW. Anxious solitude and peer exclusion: A diathesis-stress model of internalizing trajectories in childhood. Child Dev 2003; 74: 257-278. [DOI:10.1111/1467-8624.00534] [PMID]