Many doctors are not convinced of a link between iron levels and heart disease in men.

CNN: Health: Making Heartfelt Gestures

As they believe that there is a link between deprivation and lower levels of literacy, they called on the government to implement a pupil premium to address this.

BBC: Debate on literacy

They carried out detailed statistical analysis, in order to assess whether there was a link between cases of cancer and above average levels of radiation.

BBC: Radon cancer fears dismissed