Rudkjøbing Andreas, Olejaz Maria, Birk Hans Okkels, Nielsen Annegrete Juul, Hernández-Quevedo Cristina, Krasnik Allan
Section of Health Services Research, Department of Public Health, University of Copenhagen, Øster Farimagsgade 5, DK-1014 Copenhagen, Denmark.
BMJ. 2012 Jul 13;345:e4451. doi: 10.1136/bmj.e4451.