1. World Health Organization Depression Fact Sheet. 2012. http://www.who.int/mediacentre/factsheets/fs369/en/ . Last accessed 18 Sept 2014.
2. Selye H. A syndrome produced by diverse noxious agents. Nature. 1936;32:138.
3. Burchfield SR. The stress response: a new perspective. Psychosom Med. 1979;41:661–72.
4. Vale W, Spiess J, Rivier C, Rivier J. Characterization of a 41-residue ovine hypothalamic peptide that stimulates secretion of corticotropin and beta-endorphin. Science. 1981;213:1394–7.
5. Vale W, Rivier C, Brown MR, Spiess J, Koob G, Swanson L, Bilezikjian L, Bloom F, Rivier J. Chemical and biological characterization of corticotropin releasing factor. Recent Prog Horm Res. 1983;39:245–70.