Kjell Haug

Patient experiences with interventions to reduce surgery cancellations: a qualitative study

Oddbjørn Bukve, E. Hovlid, Oddbjørn Bukve, 2013, BMC Surgery.

Self-selection and bias in a large prospective pregnancy cohort in Norway.

Per Magnus, Stein Emil Vollset, Håkon K Gjessing, 2009, Paediatric and perinatal epidemiology.