[1] Univ Oslo, Fac Med, Inst Hlth & Soc, Dept Nursing Sci, Oslo, Norway
[2] Lovisenberg Diaconal Hosp, Dept Patient Safety & Res, Oslo, Norway
[3] Lovisenberg Diaconal Hosp, Dept Patient Safety & Res, Risk Study Res Grp, Oslo, Norway
[4] Lovisenberg Diaconal Hosp, Dept Surg, Oslo, Norway
[5] Lovisenberg Diaconal Hosp, Dept Surg, Anesthesia, Oslo, Norway
[6] Lovisenberg Diaconal Hosp, Dept Med, Oslo, Norway
[7] Univ Calif San Francisco, Dept Family & Hlth Care Nursing, San Francisco, CA 94143 USA