*Cochrane Database of Systematic Reviews* 2011; 6:CD006119
*Cochrane Database of Systematic Reviews* 2011; 5:CD002834
*Cochrane Database of Systematic Reviews* 2011; 4:CD003752
*Cochrane Database of Systematic Reviews* 2011; 4:CD007924
*Cochrane Database of Systematic Reviews* 2011; 4:CD008217
*Cochrane Database of Systematic Reviews* 2011; 4:CD007697
*Cochrane Database of Systematic Reviews* 2011; 3:CD007584
*Cochrane Database of Systematic Reviews* 2011; 1:CD007928
*Cochrane Database of Systematic Reviews* 2011; 1:CD006652
*Cochrane Database of Systematic Reviews* 2011; 1:CD006812