International variations in the gestational age distribution of births: an ecological study in 34 high-income countries

Marie Delnord, Laust Mortensen, Ashna D. Hindori-mohangoo, Béatrice Blondel, Mika Gissler, Michael R. Kramer, Jennifer L. Richards, Paromita Deb-Rinker, Jocelyn Rouleau, Naho Morisaki, Natasha Nassar, Francisco Bolumar, Sylvie Berrut, Anne-Marie Nybo Andersen, Michael S. Kramer, Jennifer Zeitlin, Euro-Peristat Scientific Committee