@article {de Lusignani, author = {Simon de Lusignan}, title = {In this issue: Ontologies a key concept in informatics and key for open definition of cases, exposures and outcome measures}, volume = {22}, number = {2}, pages = {i--v}, year = {2015}, doi = {10.14236/jhi.v22i2.170}, publisher = {BMJ Specialist Journals}, URL = {https://informatics.bmj.com/content/22/2/i}, eprint = {https://informatics.bmj.com/content/22/2/i.full.pdf}, journal = {BMJ Health \& Care Informatics} }