Explainer: Where were you in the #wormwars?

After doubt was cast on an influential scientific study two weeks ago, trenches were dug for the 'worm wars'. Whose side are you on?

It was supposed to be a magic bullet that would get under-privileged children in full health and into school. But in the last few weeks a row has broken out over just how useful mass 'de-worming' really is.