Sources:

National Institute of Mental Health: "Depression."
American Psychiatric Association: "Psychiatric News: Children of Depressed Parents Have More Health Problems."
CDC: "Depression in the United States Household Population, 2005-2006."
MedlinePlus: "Depression."
WebMD Medical Reference: "Depression: Recognizing the Physical Symptoms."
Office for National Statistics – UK suicide rates
SANE – Depression

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