By linking the databases, we identified on-time versus late attendance and how many CHW visits preceded appointment attendance.
We obtained information on chemical class by linking the databases of the U.S. EPA PPIS and the Pesticide Action Network PANN; an organization that compiles information on pesticide class, toxicity, and health effects from official sources) (PAN 2011), using the U.S. EPA pesticide chemical codes (PC codes) that are unique to each active ingredient.
By linking the trial database with the hospitalisation database we were able to identify trial children who had been hospitalised.
This study was conducted using de-identified records obtained by linking the CPL database, the Manitoba Immunization Monitoring System, and other Manitoba Health (MH) administrative databases after securing the approval of the Research Ethics Board of the University of Manitoba and the Health Information Privacy Committee of MH.
Mortality data were obtained between January 1987 and December 1996 by linking the NLCS database to the Central Bureau of Genealogy (The Hague, The Netherlands).
Deceased patients were excluded by linking the ECR database with the Central Bureau for Genealogy.
By linking the video database to the EMRs, information was available for the total number of consultations within the same illness-episode (contact frequency) and for whether or not the patient returned to the GP for the same condition after the recorded consultation (follow-up consultation).
As previously described [ 4], individuals who developed RA after inclusion in the MPMP and up to 31 December 2004 were identified by linking the MPMP databases to a community-based RA register [ 21, 22], the local outpatient clinic administrative register for Malmö University Hospital, the National Hospital Discharge Register [ 23], and the National Cause of Death Register [ 24].
Physician specialty was obtained by linking the Institute for Clinical Evaluative Sciences ICESS) Physician Database with the OHIP database.
The physician specialty for each visit was obtained by linking the physician billing database to the Institute of Clinical Evaluative Sciences ICESS) Physician Database (IPDB).
