1. University of Manchester; Department of Nursing, Midwifery and Social Work; Manchester UK M13 9PL
2. Kleijnen Systematic Reviews; Unit 6, Escrick Business Park Riccall Road, Escrick York UK YO19 6FD
3. University of Leeds; School of Healthcare; Room LG.12, Baines Wing Leeds UK LS2 9JT
4. The Old School House Flat Lane, Barmby Moor York UK YO42 4EQ