Reference :
http://www.who.int/features/factfiles/mental_health/en/
http://www.mind.org.uk/information-support/types-of-mental-health-problems/mental-health-problems-introduction/#.WEN_EXdh3ow
http://www.medicinenet.com/mental_illness/article.htm
http://www.malaysiandigest.com/news/582570-mental-disorder-is-going-to-affect-over-3-million-malaysians-by-2020-will-you-be-one-of-them.html
http://www.whiteswanfoundation.org/article/ten-tips-for-mental-wellbeing/
https://www.psychologytoday.com/blog/some-assembly-required/201411/the-benefits-cultivating-attitude-gratitude
http://www.helpguide.org/harvard/benefits-of-mindfulness.htm
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