Authors: Jennifer L Richards; Michael S Kramer; Paromita Deb-Rinker; Jocelyn Rouleau; Laust Mortensen; Mika Gissler; Nils-Halvdan Morken; Rolv Skjærven; Sven Cnattingius; Stefan Johansson; Marie Delnord; Siobhan M Dolan; Naho Morisaki; Suzanne Tough; Jennifer Zeitlin; Michael R Kramer Journal: JAMA Date: 2016-07-26 Impact factor: 56.272