… existing retinopathy using nationwide data in Sweden and Denmark from the prescription
registers, patient registers… Data sources and general methods used have been described in …

… identify any pre-existing questionnaire or relevant information … data and/or electronic health
records and/or X-data sources … Denmark, Germany, Norway and Sweden do data linkage at …

… registers were retained in the analysis: data are available for … related to syndromes and
genetic conditions, as well as Olney … with register staff use many different data sources to identify …

… Design and data source … is listed in the Danish Civil Registration System along with
data on gender, birth … period were available while data on emergency department and out-patients …

… the study ran over the years 2010–2013 for Danish registries (… before study entry, except for
individuals with data available … derived from heterogeneous data sources, several AESIs are …

… contemporary data available. We conducted a systematic analysis of population-based
data from two sources: (1) CP registers/… Data sources not from registers ranged from face-to-face …

… Danish national registries that included data on more than 5.9 million persons born in Denmark
… S1 in the Supplementary Appendix, available with the full text of this article at NEJM.org. …

… clinical events. This investigation was first carried out using the Danish National Patient Registry
(… All VA data used in this study are available to any investigator upon relevant approvals …

… In this study, we used linkage to the Danish Pathology Register 15 and the … clinical data,
which were not available in this study setting—an inherent challenge in register-based studies. …

… The data will not be made available to other researchers … Danish registries 11 This system
allowed for unambiguous individual‐level linkage of data from all sources used in this study …