There is a long tradition in the Nordic countries of maintaining well-established systems for health and other parts of the welfare state. Population-based registers for administrative purposes exist since decades. As data are already available, important research can be done in a cost- and time-effective manner, while maintaining personal privacy. Learn more from the illustrative film “The benefits of using Nordic population registers for research purposes” developed by SINGS now on YouTube: https://youtu.be/0o-yMGKp9Pk