@article {Nettle214, editor = {Nettle, Daniel}, title = {Happiness: the science behind your smile}, volume = {6}, number = {2}, pages = {214--214}, year = {2006}, doi = {10.7861/clinmedicine.6-2-214}, publisher = {Royal College of Physicians}, issn = {1470-2118}, URL = {https://www.rcpjournals.org/content/6/2/214}, eprint = {https://www.rcpjournals.org/content/6/2/214.full.pdf}, journal = {Clinical Medicine} }