Date	Event	Description
1 July 2008	Amended	Converted to new review format.
17 April 2008	New search has been performed	Four new studies were identified and evaluated for the purpose of this update (Griffin 2003; Larmon 2002; Moran 1994; Thiery 1979). One of these (Larmon 2002) is included in the review; the other three excluded: two because they did not report any of the prespecified outcomes (Griffin 2003; Moran 1994) and one (Thiery 1979) because it was a "complex intervention" ‐ the oestrogen used within the trial was combined with the use of an extra amniotic placed foley catheter. A study awaiting awaiting assessment in the previous review has now been excluded (Luther 1980), again because the trial evaluated a "complex intervention" of intramuscular oestradiol with PGE2.