[1] Norwegian Univ Sci & Technol NTNU, Dept Mental Hlth, Fac Med & Hlth Sci, Trondheim, Norway
[2] Norwegian Univ Sci & Technol NTNU, Dept Publ Hlth & Nursing, Fac Med & Hlth Sci, Trondheim, Norway
[3] Trondheim Reg & Univ Hosp, St Olavs Hosp, Dept Orthopaed Surg, Trondheim, Norway
[4] Norwegian Univ Sci & Technol NTNU, Dept Hlth Sci Alesund, Fac Med & Hlth Sci, Trondheim, Norway