Data Resource Profile: Extramural Leiden University Medical Center Academic Network (ELAN)

Network (ELAN) dynamic data infrastructure, based on routine healthcare data of general practitioners, hospitals and mental healthcare, linked to municipal and national data sources from Statistics Netherlands, was established with the aim to facilitate broad research topics to improve integrated patient care and health outcomes.� The dynamic data infrastructure comprises 2.6 million individuals spanning all age groups residing in South Holland province from 2007 onwards, with a diverse mix of urban and rural residents.This data infrastructure is updated on an annual basis.If residents relocate out of the area, information on death diagnoses, medication and morbidity is still accessible through national data sources.� ELAN has coded clinical measurements, laboratory findings, morbidities, medication use, healthcare contacts and referrals.By pseudonymized linkage procedures, claims data, death diagnoses and social determinants of health are also included.Although free text is not readily available in the data set, lifestyle information data have been extracted by applying text mining and natural language processing within the separate data sources (e.g.electronic patient files).� ELAN represents a collaborative effort of the regional academic and regional healthcare organizations.