Grey literature are materials and research produced by organisations outside of traditional commercial or academic publishing and distribution channels. Grey literature publication types include reports, working papers, government documents, white papers and evaluations.
Primary care prescribing data is captured by the NHS reimbursement agency, the NHSBSA, from the NHS prescription forms dispensed by community pharmacists across England. As the patients' names and the conditions for which medicines are prescribed are not required for the reimbursement process this information is not available at a national level. It is possible to estimate the number of patients receiving a particular medicine but the accuracy of the estimate will depend on the range of dosing patterns and the number of clinical indications for the medicine.
Guidelines for primary and shared care in the UK