[1] Queen Elizabeth Hosp, Dept Care Elderly, Gateshead NE9 6SX, Tyne & Wear, England
[2] Northumbria Healthcare NHS Fdn Trust, Ashington, Tyne & Wear, England
[3] Newcastle Univ, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[4] Northumbria Univ, N Tyneside, England
[5] Gateshead Hlth NHS Fdn Trust, Gateshead, England