The editorial group responsible for this previously published document have withdrawn it from publication.
Reason for withdrawal from publication
Authors have made no progress with this protocol in over a year due to difficulties with identifying potentially suitable studies. The protocol has been withdrawn.
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|27 March 2014||Amended||This protocol has now been withdrawn. See Published Notes for more details.|
Sources of support
Nottinghamshire Healthcare NHS Trust, UK.
Federal Ministry of Education and Research, Germany.
Grant no. 01KG0812
NHS Cochrane Collaboration Programme Grant Scheme, UK.