“…A validation study conducted in the CPRD in 2004 found that PD diagnoses that were accompanied by ≥2 prescriptions for an antiparkinsonian drug were confirmed by review of medical records in 90% of cases . In a second sensitivity analysis, we applied a definition of incident epilepsy used by authors of another CPRD‐based study, where a patient was required to have at least 2 anticonvulsant prescriptions recorded within 1 month before or up to 6 months after a Read code for an epileptic seizure, epilepsy, or status epilepticus.…”