1. Judd LL, Akiskal HS. The prevalence and disability of bipolar spectrum disorders in the US population: re-analysis of the ECA database taking into account subthreshold cases. J Affect Disord . 2003;73:123-131.
2. Yatham LN, Lecrubier Y, Fieve RR, et al. Quality of life in patients with bipolar I depression: data from 920 patients. Bipolar Disord . 2004;6:379-385.
3. Judd LL, Akiskal HS, Schettler PJ, et al. The long-term natural history of the weekly symptomatic status of bipolar I disorder. Arch Gen Psychiatry. 2002;59:530-537.
4. Ghaemi SN, Sachs GS, Chiou AM, et al. Is bipolar disorder still underdiagnosed? Are antidepressants overutilized? J Affect Disord . 1999;52:135-144.
5. Cha B, Kim JH, Ha TH, et al. Polarity of the first episode and time to diagnosis of bipolar I disorder. Psychiatry Investig . 2009;6:96-101. Available at: http://psychiatryinvestigation.org/journal/view.php?doi=10.4306/pi.2009.6.2.96 . Accessed June 25, 2018.
6. Zimmerman M, Galione JN, Chelminski I, et al. Psychiatric diagnoses in patients who screen positive on the Mood Disorder Questionnaire: implications for using the scale as a case-finding instrument for bipolar disorder. Psychiatry Res . 2011;185:444-449.
7. Al-Harbi KS. Treatment-resistant depression: therapeutic trends, challenges, and future directions. Patient Prefer Adherence . 2012;6:369-388.
8. Hirschfeld RM, Cass AR, Holt DC, et al. Screening for bipolar disorder in patients treated for depression in a family medicine clinic. J Am Board Fam Pract . 2005;18:233-239.
9. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders , 5th ed. Washington, D.C.: American Psychiatric Publishing. 2013.
10. Poon Y, Chung KF, Tso KC, et al. The use of Mood Disorder Questionnaire, Hypomania Checklist-32 and clinical predictors for screening previously unrecognised bipolar disorder in a general psychiatric setting. Psychiatry Res . 2012;195:111-117.
11. Gilbody S, Richards D, Brealey S, et al. Screening for depression in medical settings with the Patient Health Questionnaire (PHQ): a diagnostic meta-analysis. J Gen Intern Med . 2007;22:1596-1602.
12. Kroenke K, Spitzer RL, Williams JB. The PHQ-9: validity of a brief depression severity measure. J Gen Intern Med . 2001;16:606-613.
13. Miller CJ, Klugman J, Berv DA, et al. Sensitivity and specificity of the Mood Disorder Questionnaire for detecting bipolar disorder. J Affect Disord . 2004;81:167-171.
14. Sasdelli A, Lia L, Luciano CC, et al. Screening for bipolar disorder symptoms in depressed primary care attenders: comparison between Mood Disorder Questionnaire and Hypomania Checklist (HCL-32). Psychiatry J . 2013;2013:548349.
15. Vohringer PA, Jimenez MI, Igor MA, et al. Detecting mood disorder in resource-limited primary care settings: comparison of a self-administered screening tool to general practitioner assessment. J Med Screen . 2013;20:118-124.
16. Perlis RH, Brown E, Baker RW, et al. Clinical features of bipolar depression versus major depressive disorder in large multicenter trials. Am J Psychiatry . 2006;163:225-231.
17. Moreno C, Hasin DS, Arango C, et al. Depression in bipolar disorder versus major depressive disorder: results from the National Epidemiologic Survey on Alcohol and Related Conditions. Bipolar Disord . 2012;14:271-282.
18. Mitchell PB, Malhi GS. Bipolar depression: phenomenological overview and clinical characteristics. Bipolar Disord . 2004;6:530-539.
19. Solomon DA, Leon AC, Maser JD, et al. Distinguishing bipolar major depression from unipolar major depression with the screening assessment of depression-polarity (SAD-P). J Clin Psychiatry . 2006;67:434-442.
20. Bowden CL. A different depression: clinical distinctions between bipolar and unipolar depression. J Affect Disord . 2005;84:117-125.
21. Goes FS, Sadler B, Toolan J, et al. Psychotic features in bipolar and unipolar depression. Bipolar Disord . 2007;9:901-906.
22. Buzuk G, Lojko D, Owecki M, et al. Depression with atypical features in various kinds of affective disorders. Psychiatr Pol . 2016;50:827-838.
23. Liu X, Agerbo E, Li J, et al. Depression and anxiety in the postpartum period and risk of bipolar disorder: a Danish Nationwide Register-Based Cohort Study. J Clin Psychiatry . 2017;78:e469-e476.
