SYSTEMATIC REVIEW R E Clifford, Corresponding Author rachael.clifford@nhs.uk orcid.org/0000-0001-7065-0197 Institute of Cancer Medicine, The University of Liverpool, UK Correspondence Rachael Clifford, Institute of Cancer Medicine, University of Liverpool, Liverpool, L69 3GE, Tel: (+44) 1517942000 Email: rachael.clifford@nhs.uk Search for more papers by this author H Fowler, N Manu, The Countess of Chester Hospital NHS Foundation Trust, Chester, UK Search for more papers by this author D...