Open access publishing is a concious choice for some researchers. They like to contribute to transparency and openness in science or maybe they want to make their research visible to the whole community. For other researchers, open access publishing may simply be required by their funder. Public funders such as the NWO, ZON-MW or Horizon aim at 100% open access from 2021 onwards. In the future, open access may also be part of research assessment. So as a researcher, you need to be ready.
More information can be found on the website of the Central Medical Library.