[1] Stockholms Sjukhem Fdn, R&D Unit, SE-11235 Stockholm, Sweden
[2] Karolinska Inst, Dept Clin Sci Intervent & Technol, Div Surg, Stockholm, Sweden
[3] Karolinska Inst, Med Management Ctr, Dept Learning Informat Management & Eth, Stockholm, Sweden
[4] Univ Manchester, Sch Nursing Midwifery & Social Work, Manchester M13 9PL, Lancs, England
[5] Uppsala Univ, Dept Publ Hlth & Caring Sci Clin Nutr & Metab, Uppsala, Sweden