[1] Univ Aberdeen, Hlth Serv Res Unit, Aberdeen, Scotland
[2] Univ Aberdeen, Hlth Serv Res Unit, Ctr Healthcare Randomised Trials CHaRT, Aberdeen, Scotland
[3] Newcastle Univ, Cochrane Incontinence Grp, Inst Hlth & Soc, Newcastle Upon Tyne, Tyne & Wear, England
[4] Newcastle Univ, Evidence Synth Grp, Inst Hlth & Soc, Newcastle Upon Tyne, Tyne & Wear, England
[5] Newcastle Univ, Hlth Econ Grp, Inst Hlth & Soc, Newcastle Upon Tyne, Tyne & Wear, England