scientific article
author: David M. Evans, Mark Lathrop, Jes Olesen, Mads Melbye, Thomas Werge, Bjarke Feenstra, Lavinia Paternoster, Frank Geller, Thomas F. Hansen, Robert J. Weyant, Ann-Louise Esserlind, Thorkild I.A. Sørensen, George Davey Smith, Mary L. Marazita, Heather Allison Boyd