[1] Oslo Univ Hosp, Div Med, Dept Digital Hlth Res, Oslo, Norway
[2] Oslo Metropolitan Univ, Inst Nursing & Hlth Promot, Oslo, Norway
[3] Oslo Metropolitan Univ, Fac Hlth Sci, Inst Nursing & Hlth Promot, Postbox 4, N-0130 Oslo, Norway
[4] Norwegian Univ Sci & Technol, NTNU, Fac Med & Hlth Sci, Trondheim, Norway