Nordeng Hedvig, Lupattelli Angela, Wood Mollie
PharmacoEpidemiology and Drug Safety Research Group, School of Pharmacy, and PharmaTox Strategic Research Initiative, Faculty of Mathematics and Natural Sciences, University of Oslo, Norway.
Department of Child Health, Norwegian Institute of Public Health, Oslo, Norway.
BMJ. 2017 Sep 6;358:j3950. doi: 10.1136/bmj.j3950.