Childhood cancer survivors
Survivors included in the LATER cohort were traced via the Municipal Personal Records Database (Dutch: Basisregistratie Personen [BRP]) to identify their vital status and most recent address. All survivors confirmed alive and with a known address in the Netherlands were eligible for invitation. Survivors who were lost to follow-up, living abroad, objected to participate in any scientific research, or who were considered ineligible to participate by their late effects physician (e.g. on active cancer treatment) were excluded.