Skip to main content
. 2013 Jul 26;2013(7):CD006920. doi: 10.1002/14651858.CD006920.pub3
Study Reason for exclusion
Chen 2004 No reply to written and electronic request; study design, allocation concealment and outcomes unclear
Chen 2009 No reply to electronic request; study design, methods and results not known
Chen 2012 No outcomes of interest
Cui 2007 No reply to electronic request; study design, methods and results not known
Cui 2011 Inadequate randomisation process in study design, based on odd and even numbers
Evans 2005 Lack details on pregnancy outcome, study design, allocation concealment and type of randomisation; no reply to written or electronic letters
Feliciani 2011 No reply to electronic request; study numbers, randomisation process and outcomes unclear
Li 2009 No reply to electronic request; study design, methods and results not known
Omodei 2010 No reply to electronic request; study design, allocation concealment and outcomes unclear
Quintero 2004 Lacks details on allocation concealment and randomisation, no reply to requests for details; crossover design