Does screen time really affect medical students' surgery skills?

Medical students are losing the dexterity to stitch up their patients because they are spending too much time in front of screens. That's the claim from one professor of surgery who says trainee doctors are "less competent", compared to their older colleagues, at using their hands. Professor Roger Kneebone, from Imperial College London, says young people have so little experience of craft skills that they struggle with practical tasks. It's a worrying thought - but how true is it? Does screen time impact dexterity?