https://www.boundless.com/biology/textbooks/boundless-biology-textbook/t...
http://www.dpag.ox.ac.uk/research/metabolism-endocrinology
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Obesity_a...
http://www.medscape.org/viewarticle/502825
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