tokens: The yearly disease incidence increased by 56 % , from 3.4 ( 95 % CI : 2.8 - 4.2 ) per 10 000 births ( or 1 in 2941 births ) in 2009 to 5.3 ( 95 % CI : 4.6 - 6.1 ) per 10 000 births ( or 1 in 1886 births ) in 2015 ( P < .001 ) .