Links:
- www.webmd.com/depression/guide/depression-symptoms-causes#1
- https://www.livescience.com/34718-depression-treatment-psychotherapy-anti-depressants.html
- https://www.webmd.com/depression/guide/untreated-depression-effects#1
- http://www.pearlsprogram.org/Our-Program/About-Depression/Causes-and-Effects-of-Depression.aspx
- http://www.dbsalliance.org/site/PageServer?pagename=education_anxiety_stress_brain_structure
- https://www.everydayhealth.com/columns/therese-borchard-sanity-break/ways-to-help-a-friend-or-family-member-with-depression/
- https://www.helpguide.org/articles/depression/coping-with-depression.htm
- https://www.webmd.com/depression/guide/depression-types#3
- https://www.healthline.com/health/clinical-depression#Overview1
- https://www.mayoclinic.org/diseases-conditions/persistent-depressive-disorder/symptoms-causes/syc-20350929
- https://www.helpguide.org/articles/bipolar-disorder/bipolar-disorder-signs-and-symptoms.htm#signs