. 2017 Oct 30;2017(10):CD006491. doi: 10.1002/14651858.CD006491.pub4
Copyright © 2017 The Authors. Cochrane Database of Systematic Reviews published by John Wiley & Sons, Ltd. on behalf of The Cochrane Collaboration.
This is an open access article under the terms of the Creative Commons Attribution‐Non‐Commercial Licence, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
1.
Study flow diagram.