1
by Krogstad, Unni, Ormstad, Sari S., Natvig Norderhaug, Inger
Published 2007
Knowledge Centre for the Health Services at The Norwegian Institute of Public Health (NIPH)

2
by Ormstad, Sari S., Graff, Bjørn Anton, Natvig Norderhaug, Inger
Published 2010
Norwegian Knowledge Centre for the Health Services