@article {e004039corr1, editor = {,}, title = {Correction}, volume = {4}, number = {1}, elocation-id = {e004039corr1}, year = {2014}, doi = {10.1136/bmjopen-2013-004039corr1}, publisher = {British Medical Journal Publishing Group}, issn = {2044-6055}, URL = {https://bmjopen.bmj.com/content/4/1/e004039corr1}, eprint = {https://bmjopen.bmj.com/content/4/1/e004039corr1.full.pdf}, journal = {BMJ Open} }