[1] Diakonhjemmet Hosp, REMEDY Ctr, Div Res & Innovat, Prevent Cardiorheuma Clin, Diakonveien 12, N-0370 Oslo, Norway
[2] Kings Coll London, Fac Nursing Midwifery & Palliat Care, London SE1 8WA, England
[3] St Bartholomews Hosp, Barts Hlth NHS Trust, London EC1A 7DN, England
[4] St Georges Univ London, Mol & Clin Sci Res Inst, Cranmer Terrace, London SW1 70RE, England