There was access to complete clinical data including date of LDN, date of disease relapse, last follow-up, or death for all patients.
The relevant study data (including date of application for certification, date of initial certification, date of full certification and date of recertification) for each participating breast centre or hospital breast care unit were collected by the DKG-commissioned certification service provider (DKG-CSP) on a monthly basis.
The CRS has maintained vital statistics data, including date of birth, change of address, date of emigration, and exact date of death for the Danish population since 1968.
Patient information including date of birth, date of sample collection and gender was routinely collected.
For each patient, medical records were collected in the NHI claim database, including date of admission, date of discharge, dates of visits, clinical diagnosis, prescription and total expenditure.
The Guangzhou Bureau of Health provided individual information for 112,280 deaths from 1 January 2003 to 31 December 2007, including date of birth, date of death, cause of death, sex, educational attainment and occupation.
Notifications from June 2003 to December 2008 were retrieved from the Dutch national database, including date of symptom onset, date of laboratory-confirmed diagnosis, and date of reporting to the Municipal Health Service (MHS).
Priority group 2 variables (duration and locale of exposure; hospitalization, including start date; isolation, including start date; and death, including date of death) provide information that can be used to evaluate the risk for hospitalization or death associated with exposure, length of incubation, and impact of isolation.
Disease-free survival was calculated from the date of surgery to date of last follow-up including date of death from any cause if there were no recurrence or date of first disease recurrence.
The Norwegian Central Population Registry (NCPR) contains demographic information on all residents in Norway, including date of birth and date of emigration or death [ 12].
