It may be because of higher levels of a blood-clotting protein in A, B and AB blood groups.
Katie Falkenberg's photo feature on mothers caring for children damaged by the Zika virus in Brazil was a Pulitzer Prize finalist in 2017.
Charlie, now eight, started losing his sight aged four, and has only been able to see close up until now.
Surgeon Ian Paterson was convicted of intentionally wounding patients with unnecessary operations.
Three vloggers are speaking directly to their mental illnesses.