He says there has not been enough study of mixed martial arts to describe the risks.

NPR: Mixed Martial Arts: Sport or Spectacle?

This attracted a great deal of attention, although attempts to replicate the study have had mixed results.

ECONOMIST: Music as healing

Views within public authorities on whether FOI has a damaging "chilling effect" on frank discussion and minuting of meetings appear to be very mixed, according to a study commissioned by the ministry.

BBC: Successes and costs of freedom of information, says MoJ