Institutional Birth (IB): includes all deliveries that occurred at a health facility. Dataset: F11: Fødested. 2000. [online database]. Oslo: Folkehelseinstituttet, Medisinsk fødselsregister [Norwegian Institute of Public Health (NIPH), Medical Birth Registry]; 2001 (http://statistikkbank.fhi.no/mfr, accessed 10 October 2011, in Norwegian).