"Thus, while hangover is a common phenomenon among college drinkers, for most of them it occurs rarely enough that it is unlikely to have a major deleterious impact on academic performance, " Dr Slutske said.

BBC: NEWS | Health | Women 'suffer worse hangovers'

But these numbers are challenged by the opponents of abortion, who argue that it is a rare phenomenon in the developing world, and that legalising it will make it more common.

ECONOMIST: Reproductive health