@misc{8663,
  author = {J. Watson and B. Nicholson and W. Hamilton and S. Price},
  title = {Identifying clinical features in primary care electronic health record studies: methods for codelist development},
  year = {2017},
  journal = {BMJ Open},
  volume = {7},
  number = {11},
  pages = {e019637},
  issn = {2044-6055},
  doi = {10.1136/bmjopen-2017-019637},
}