I thought this would be a good opportunity to revisit this post, in which I looked at a recent report commissioned by the City of Oslo, with support from the Norwegian Ministry of Justice, into violence against sex workers under the sex purchase ban. At the time I had to rely on Google Translate but since then a native Norwegian speaker, Thomas Larson, has given us an English version. You can read it in full here. And you should.
Many thanks to Thomas for the translation.