title: The purpose of rating quality of evidence differs in an overview, as compared to guidelines or recommendations.
authors.affiliation: Nursing, Midwifery and Allied Health Professions Research Unit, Glasgow Caledonian University, Buchanan House, Cowcaddens Road, Glasgow G4 0BA, UK. Electronic address: alex.pollock@gcu.ac.uk.
authors.forename: Alex
authors.initials: A
authors.lastname: Pollock
authors.affiliation: Nursing, Midwifery and Allied Health Professions Research Unit, Glasgow Caledonian University, Buchanan House, Cowcaddens Road, Glasgow G4 0BA, UK.
authors.forename: Marian C
authors.initials: MC
authors.lastname: Brady
authors.affiliation: Nursing, Midwifery and Allied Health Professions Research Unit, Glasgow Caledonian University, Buchanan House, Cowcaddens Road, Glasgow G4 0BA, UK.
authors.forename: Sybil E
authors.initials: SE
authors.lastname: Farmer
authors.affiliation: Academic Section of Geriatric Medicine, Level 2, New Lister Building, Glasgow Royal Infirmary, Glasgow G31 2ER, UK.
authors.forename: Peter
authors.initials: P
authors.lastname: Langhorne
authors.affiliation: Centre for Clinical Brain Sciences, Royal Infirmary of Edinburgh, Little France Crescent, Edinburgh EH16 5NN, UK.
authors.forename: Gillian E
authors.initials: GE
authors.lastname: Mead
authors.affiliation: Wissenschaftliches Institut, Private Europäische Medizinische Akademie der Klinik Bavaria in Kreischa GmbH, An der Wolfsschlucht 1-2, 01731 Kreischa, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Mehrholz
authors.affiliation: Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics), University of Oxford, Churchill Hospital, Oxford OX3 7LE, UK.
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Wiffen
authors.affiliation: Institute for Applied Health Research and the School of Health and Life Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, UK.
authors.forename: Frederike
authors.initials: F
authors.lastname: van Wijck
mesh_terms: D019317:Evidence-Based Medicine; D017410:Practice Guidelines as Topic